CSS3 Optical Illusions

Andrei Prikaznov

Jan. 05, 12 · Interview

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today i have prepared something interesting for you. this is a demonstration of several optical illusions in css3 (without using any images or javascript). enjoy the results.

here are samples and downloadable package:

download in package

ok, download the example files and let's start coding!

step 1. html

as usual, we start with the html. here is full html code of all 6 demos.

index.html

<!doctype html>
<html lang="en">
    <head>
        <meta charset="utf-8" />
        <title>css3 optical illusions | script tutorials</title>

        <link href="css/layout.css" type="text/css" rel="stylesheet">
        <link href="css/illusions.css" type="text/css" rel="stylesheet">
    </head>
    <body>

        <header>
            <h2>css3 optical illusions</h2>
            <a href="http://www.script-tutorials.com/css3-optical-illusions/" class="stuts">back to original tutorial on <span>script tutorials</span></a>
        </header>

        <div class="container">
            <span id="page1"></span>
            <span id="page2"></span>
            <span id="page3"></span>
            <span id="page4"></span>
            <span id="page5"></span>
            <span id="page6"></span>

            <a class="contr" href="#page1" title="are these lines parallel? yes, of course">1</a>
            <a class="contr" href="#page2" title="the circles rotate?">2</a>
            <a class="contr" href="#page3" title="the upper half of each figure is same as lower half, is not it? lets turn them, the difference becomes much bigger">3</a>
            <a class="contr" href="#page4" title="at the intersections of white lines, except for the intersection, where you keep your sight at the moment, we can see small gray spots.">4</a>
            <a class="contr" href="#page5" title="see inside for some time. they saw the green stains? but nothing green is not here.">5</a>
            <a class="contr" href="#page6" title="another one move effect">6</a>

            <div class="demos">
                <div id="i1">
                    <div class="row"></div>
                    <div class="row"></div>
                    <div class="row"></div>
                    <div class="row"></div>
                    <div class="row"></div>
                    <div class="row"></div>
                    <div class="row"></div>
                </div>

                <div id="i2">
                    <div class="cir1">
                        <div id="o1"></div><div id="o2"></div><div id="o3"></div>
                        <div id="o4"></div><div id="o5"></div><div id="o6"></div>
                        <div id="o7"></div><div id="o8"></div><div id="o9"></div>
                        <div id="o10"></div><div id="o11"></div><div id="o12"></div>
                    </div>
                    <div class="cir2">
                        <div id="o1"></div><div id="o2"></div><div id="o3"></div>
                        <div id="o4"></div><div id="o5"></div><div id="o6"></div>
                        <div id="o7"></div><div id="o8"></div><div id="o9"></div>
                        <div id="o10"></div><div id="o11"></div><div id="o12"></div>
                    </div>
                    <div class="cir3">
                        <div id="o1"></div><div id="o2"></div><div id="o3"></div>
                        <div id="o4"></div><div id="o5"></div><div id="o6"></div>
                        <div id="o7"></div><div id="o8"></div><div id="o9"></div>
                        <div id="o10"></div><div id="o11"></div><div id="o12"></div>
                    </div>
                    <div class="cir4">
                        <div id="o1"></div><div id="o2"></div><div id="o3"></div>
                        <div id="o4"></div><div id="o5"></div><div id="o6"></div>
                        <div id="o7"></div><div id="o8"></div><div id="o9"></div>
                        <div id="o10"></div><div id="o11"></div><div id="o12"></div>
                    </div>
                    <div class="cir5">
                        <div id="o1"></div><div id="o2"></div><div id="o3"></div>
                        <div id="o4"></div><div id="o5"></div><div id="o6"></div>
                        <div id="o7"></div><div id="o8"></div><div id="o9"></div>
                        <div id="o10"></div><div id="o11"></div><div id="o12"></div>
                    </div>
                    <div class="cir6">
                        <div id="o1"></div><div id="o2"></div><div id="o3"></div>
                        <div id="o4"></div><div id="o5"></div><div id="o6"></div>
                        <div id="o7"></div><div id="o8"></div><div id="o9"></div>
                        <div id="o10"></div><div id="o11"></div><div id="o12"></div>
                    </div>
                    <div class="cir7">
                        <div id="o1"></div><div id="o2"></div><div id="o3"></div>
                        <div id="o4"></div><div id="o5"></div><div id="o6"></div>
                        <div id="o7"></div><div id="o8"></div><div id="o9"></div>
                        <div id="o10"></div><div id="o11"></div><div id="o12"></div>
                    </div>
                    <div class="cir8">
                        <div id="o1"></div><div id="o2"></div><div id="o3"></div>
                        <div id="o4"></div><div id="o5"></div><div id="o6"></div>
                        <div id="o7"></div><div id="o8"></div><div id="o9"></div>
                        <div id="o10"></div><div id="o11"></div><div id="o12"></div>
                    </div>
                    <div class="cir9">
                        <div id="o1"></div><div id="o2"></div><div id="o3"></div>
                        <div id="o4"></div><div id="o5"></div><div id="o6"></div>
                        <div id="o7"></div><div id="o8"></div><div id="o9"></div>
                        <div id="o10"></div><div id="o11"></div><div id="o12"></div>
                    </div>
                </div>

                <div id="i3">
                    <div class="pos">38</div>
                    <div class="rev">38</div>
                </div>

                <div id="i4">
                    <div class="row"></div>
                    <div class="row"></div>
                    <div class="row"></div>
                    <div class="row"></div>
                    <div class="row"></div>
                    <div class="row"></div>
                    <div class="row"></div>
                    <div class="row"></div>
                    <div class="row"></div>
                    <div class="row"></div>
                    <div class="row"></div>
                    <div class="row"></div>
                </div>

                <div id="i5">
                    <div>
                        <div id="o1"></div><div id="o2"></div><div id="o3"></div>
                        <div id="o4"></div><div id="o5"></div><div id="o6"></div>
                        <div id="o7"></div><div id="o8"></div><div id="o9"></div>
                        <div id="o10"></div><div id="o11"></div><div id="o12"></div>
                    </div>
                </div>

                <div id="i6">
                    <div>
                        <div class="yellow r1">
                            <div class="pink r2">
                                <div class="yellow r3">
                                    <div class="pink r4"></div>
                                </div>
                            </div>
                        </div>
                    </div>
                    <div>
                        <div class="yellow r1">
                            <div class="pink r2">
                                <div class="yellow r3">
                                    <div class="pink r4"></div>
                                </div>
                            </div>
                        </div>
                    </div>
                    <div>
                        <div class="yellow r1">
                            <div class="pink r2">
                                <div class="yellow r3">
                                    <div class="pink r4"></div>
                                </div>
                            </div>
                        </div>
                    </div>
                    <div>
                        <div class="yellow r1">
                            <div class="pink r2">
                                <div class="yellow r3">
                                    <div class="pink r4"></div>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>

            </div>
        </div>
    </body>
</html>

step 2. css

here are the css styles. maybe you’ve noticed that in our html i have two css files: layout.css and illusions.css. the first file (layout.css) contain the styles of our test page. we will not publish these styles in this article, but if you wish – you can find these styles in our package.

css/illusions.css

span {
    display: none;
}
.contr {
    color: #000000;
    cursor: pointer;
    float: left;
    font-size: 16px;
    font-weight: bold;
    height: 30px;
    line-height: 30px;
    margin: 10px;
    text-align: center;
    text-decoration: none;
    width: 60px;

    -webkit-border-radius:10px;
    -moz-border-radius:10px;
    -ms-border-radius:10px;
    -o-border-radius:10px;
    border-radius:10px;

    background-color:#e3e3ff;
    background: -moz-linear-gradient(#ffffff, #eee);
    background: -ms-linear-gradient(#ffffff, #eee);
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #ffffff), color-stop(100%, #eee));
    background: -webkit-linear-gradient(#ffffff, #eee);
    background: -o-linear-gradient(#ffffff, #eee);
    filter: progid:dximagetransform.microsoft.gradient(startcolorstr='#ffffff', endcolorstr='#eee');
    -ms-filter: "progid:dximagetransform.microsoft.gradient(startcolorstr='#ffffff', endcolorstr='#eee')";
    background: linear-gradient(#ffffff, #eee);
}
.contr:hover{
    background-color:#e3e3ff;
    box-shadow:0px 0px 4px rgba(0,0,0,0.5) inset, 0px 0px 0px 4px rgba(51,51,204,0.5);
    -moz-box-shadow:0px 0px 4px rgba(0,0,0,0.5) inset, 0px 0px 0px 4px rgba(51,51,204,0.5);
    -webkit-box-shadow:0px 0px 4px rgba(0,0,0,0.5) inset, 0px 0px 0px 4px rgba(51,51,204,0.5);
}
.demos {
    background-color: #b2b2b2;
    display: block;
    height: 640px;
    margin-top: 55px;
    overflow: hidden;
    position: relative;
}
.demos > div {
    display: none;
}
#page1:target ~ .demos #i1 {
    display: block;
}
#page2:target ~ .demos #i2 {
    display: block;
}
#page3:target ~ .demos #i3 {
    display: block;
}
#page4:target ~ .demos #i4 {
    display: block;
}
#page5:target ~ .demos #i5 {
    display: block;
}
#page6:target ~ .demos #i6 {
    display: block;
}

/* illusion 1 */
#i1 {
    width: 900px;
}
#i1 .row {
    background-color: #fff;
    border-bottom: 2px solid #888;
    height: 90px;

    -webkit-background-size: 140px 70px;
    -moz-background-size: 140px 70px;
    -ms-background-size: 140px 70px;
    -o-background-size: 140px 70px;
    background-size: 140px 70px;

    background-position: 0 50%;
    background-image: -webkit-linear-gradient(0deg, #000 50%, transparent 50%, transparent);
    background-image: -moz-linear-gradient(0deg, #000 50%, transparent 50%, transparent);
    background-image: -ms-linear-gradient(0deg, #000 50%, transparent 50%, transparent);
    background-image: -o-linear-gradient(0deg, #000 50%, transparent 50%, transparent);
    background-image: linear-gradient(0deg, #000 50%, transparent 50%, transparent);
}
#i1 .row:nth-child(3n+3) {
    background-position: 60px 50%;
}
#i1 .row:nth-child(2n+2) {
    background-position: 30px 50%;
}

/* illusion 2 */
#i2 {
    background-color: #98cb00;
    height: 640px;
    margin: 0 auto;
    overflow: hidden;
    padding: 0 150px;
    position: relative;
    width: 600px;
}
#i2  > div {
    float: left;
    height: 105px;
    padding-left: 90px;
    padding-top: 90px;
    position: relative;
    width: 105px;
}
#i2  div div {
    border: 1px outset #fff;
    height: 20px;
    position: absolute;
    width: 30px;

    -webkit-border-radius: 100px / 50px;
    -moz-border-radius: 100px / 50px;
    -ms-border-radius: 100px / 50px;
    -o-border-radius: 100px / 50px;
    border-radius: 100px / 50px;

    background: -webkit-linear-gradient(top, #580402, #a63b17, #580402, #a63b17, #580402);
    background: -moz-linear-gradient(top, #580402, #a63b17, #580402, #a63b17, #580402);
    background: -ms-linear-gradient(top, #580402, #a63b17, #580402, #a63b17, #580402);
    background: -o-linear-gradient(top, #580402, #a63b17, #580402, #a63b17, #580402);
    background: linear-gradient(top, #580402, #a63b17, #580402, #a63b17, #580402);
}
#i2 #o1 {
    -webkit-transform: rotate(-30deg) translatex(70px);
    -moz-transform: rotate(-30deg) translatex(70px);
    -ms-transform: rotate(-30deg) translatex(70px);
    -o-transform: rotate(-30deg) translatex(70px);
    transform: rotate(-30deg) translatex(70px);
}
#i2 #o2 {
    -webkit-transform: rotate(-60deg) translatex(70px);
    -moz-transform: rotate(-60deg) translatex(70px);
    -ms-transform: rotate(-60deg) translatex(70px);
    -o-transform: rotate(-60deg) translatex(70px);
    transform: rotate(-60deg) translatex(70px);
}
#i2 #o3 {
    -webkit-transform: rotate(-90deg) translatex(70px);
    -moz-transform: rotate(-90deg) translatex(70px);
    -ms-transform: rotate(-90deg) translatex(70px);
    -o-transform: rotate(-90deg) translatex(70px);
    transform: rotate(-90deg) translatex(70px);
}
#i2 #o4 {
    -webkit-transform: rotate(-120deg) translatex(70px);
    -moz-transform: rotate(-120deg) translatex(70px);
    -ms-transform: rotate(-120deg) translatex(70px);
    -o-transform: rotate(-120deg) translatex(70px);
    transform: rotate(-120deg) translatex(70px);
}
#i2 #o5 {
    -webkit-transform: rotate(-150deg) translatex(70px);
    -moz-transform: rotate(-150deg) translatex(70px);
    -ms-transform: rotate(-150deg) translatex(70px);
    -o-transform: rotate(-150deg) translatex(70px);
    transform: rotate(-150deg) translatex(70px);
}
#i2 #o6 {
    -webkit-transform: rotate(-180deg) translatex(70px);
    -moz-transform: rotate(-180deg) translatex(70px);
    -ms-transform: rotate(-180deg) translatex(70px);
    -o-transform: rotate(-180deg) translatex(70px);
    transform: rotate(-180deg) translatex(70px);
}
#i2 #o7 {
    -webkit-transform: rotate(-210deg) translatex(70px);
    -moz-transform: rotate(-210deg) translatex(70px);
    -ms-transform: rotate(-210deg) translatex(70px);
    -o-transform: rotate(-210deg) translatex(70px);
    transform: rotate(-210deg) translatex(70px);
}
#i2 #o8 {
    -webkit-transform: rotate(-240deg) translatex(70px);
    -moz-transform: rotate(-240deg) translatex(70px);
    -ms-transform: rotate(-240deg) translatex(70px);
    -o-transform: rotate(-240deg) translatex(70px);
    transform: rotate(-240deg) translatex(70px);
}
#i2 #o9 {
    -webkit-transform: rotate(-270deg) translatex(70px);
    -moz-transform: rotate(-270deg) translatex(70px);
    -ms-transform: rotate(-270deg) translatex(70px);
    -o-transform: rotate(-270deg) translatex(70px);
    transform: rotate(-270deg) translatex(70px);
}
#i2 #o10 {
    -webkit-transform: rotate(-300deg) translatex(70px);
    -moz-transform: rotate(-300deg) translatex(70px);
    -ms-transform: rotate(-300deg) translatex(70px);
    -o-transform: rotate(-300deg) translatex(70px);
    transform: rotate(-300deg) translatex(70px);
}
#i2 #o11 {
    -webkit-transform: rotate(-330deg) translatex(70px);
    -moz-transform: rotate(-330deg) translatex(70px);
    -ms-transform: rotate(-330deg) translatex(70px);
    -o-transform: rotate(-330deg) translatex(70px);
    transform: rotate(-330deg) translatex(70px);
}
#i2 #o12 {
    -webkit-transform: rotate(0deg) translatex(70px);
    -moz-transform: rotate(0deg) translatex(70px);
    -ms-transform: rotate(0deg) translatex(70px);
    -o-transform: rotate(0deg) translatex(70px);
    transform: rotate(0deg) translatex(70px);
}

/* illusion 3 */
#i3 {
    color: #000000;
    font-family: times new roman;
    font-size: 250px;
    padding-left: 300px;
}
#i3 .rev {
    text-align: right;

    -webkit-transform: rotate(-180deg);
    -moz-transform: rotate(-180deg);
    -ms-transform: rotate(-180deg);
    -o-transform: rotate(-180deg);
    transform: rotate(-180deg);
}

/* illusion 4 */
#i4 .row {
    background-color: #fff;
    border-bottom: 5px solid #fff;
    height: 50px;

    -webkit-background-size: 60px 50px;
    -moz-background-size: 60px 50px;
    -ms-background-size: 60px 50px;
    -o-background-size: 60px 50px;
    background-size: 60px 50px;

    background-position: 0 50%;
    background-image: -webkit-linear-gradient(0deg, #000 90%, transparent 10%, transparent);
    background-image: -moz-linear-gradient(0deg, #000 90%, transparent 10%, transparent);
    background-image: -ms-linear-gradient(0deg, #000 50%, transparent 50%, transparent);
    background-image: -o-linear-gradient(0deg, #000 50%, transparent 50%, transparent);
    background-image: linear-gradient(0deg, #000 50%, transparent 50%, transparent);
}

/* illusion 5 */
@-webkit-keyframes custom_effect {
    0% {opacity: 0;}
    33% {opacity: 1;}
    100% {opacity: 1;}
}
@-moz-keyframes custom_effect {
    0% {opacity: 0;}
    33% {opacity: 1;}
    100% {opacity: 1;}
}
#i5 {
    background-color: #b2b2b2;
    height: 600px;
    margin: 0 auto;
    overflow: hidden;
    position: relative;
    width: 600px;
}
#i5  > div {
    float: left;
    height: 200px;
    padding-left: 200px;
    padding-top: 200px;
    position: relative;
    width: 200px;
}
#i5  div div {
    height: 50px;
    position: absolute;
    width: 50px;

    -webkit-border-radius: 50px;
    -moz-border-radius: 50px;
    -ms-border-radius: 50px;
    -o-border-radius: 50px;
    border-radius: 50px;

    background-color: #b2b2b2;
    background-image: -webkit-radial-gradient(50% 50%, circle, #fd19fd, #b2b2b2 70%);
    background-image: -moz-radial-gradient(50% 50%, circle, #fd19fd, #b2b2b2 70%);
    background-image: -o-radial-gradient(50% 50%, circle, #fd19fd, #b2b2b2 70%);
    background-image: radial-gradient(50% 50%, circle, #fd19fd, #b2b2b2 70%);

    -moz-animation-name: custom_effect;
    -moz-animation-duration: 1.2s;
    -moz-animation-timing-function: linear;
    -moz-animation-iteration-count: infinite;
    -moz-animation-direction: normal;
    -moz-animation-delay: 0;
    -moz-animation-play-state: running;
    -moz-animation-fill-mode: forwards;

    -webkit-animation-name: custom_effect;
    -webkit-animation-duration: 1.2s;
    -webkit-animation-timing-function: linear;
    -webkit-animation-iteration-count: infinite;
    -webkit-animation-direction: normal;
    -webkit-animation-delay: 0;
    -webkit-animation-play-state: running;
    -webkit-animation-fill-mode: forwards;
}

#i5 #o1 {
  -moz-transform: rotate(30deg) translatex(150px);
  -moz-animation-delay: 0.1s;
  -webkit-transform: rotate(30deg) translatex(150px);
  -webkit-animation-delay: 0.1s;
}
#i5 #o2 {
  -moz-transform: rotate(60deg) translatex(150px);
  -moz-animation-delay: 0.2s;
  -webkit-transform: rotate(60deg) translatex(150px);
  -webkit-animation-delay: 0.2s;
}
#i5 #o3 {
  -moz-transform: rotate(90deg) translatex(150px);
  -moz-animation-delay: 0.3s;
  -webkit-transform: rotate(90deg) translatex(150px);
  -webkit-animation-delay: 0.3s;
}
#i5 #o4 {
  -moz-transform: rotate(120deg) translatex(150px);
  -moz-animation-delay: 0.4s;
  -webkit-transform: rotate(120deg) translatex(150px);
  -webkit-animation-delay: 0.4s;
}
#i5 #o5 {
  -moz-transform: rotate(150deg) translatex(150px);
  -moz-animation-delay: 0.5s;
  -webkit-transform: rotate(150deg) translatex(150px);
  -webkit-animation-delay: 0.5s;
}
#i5 #o6 {
  -moz-transform: rotate(180deg) translatex(150px);
  -moz-animation-delay: 0.6s;
  -webkit-transform: rotate(180deg) translatex(150px);
  -webkit-animation-delay: 0.6s;
}
#i5 #o7 {
  -moz-transform: rotate(210deg) translatex(150px);
  -moz-animation-delay: 0.7s;
  -webkit-transform: rotate(210deg) translatex(150px);
  -webkit-animation-delay: 0.7s;
}
#i5 #o8 {
  -moz-transform: rotate(240deg) translatex(150px);
  -moz-animation-delay: 0.8s;
  -webkit-transform: rotate(240deg) translatex(150px);
  -webkit-animation-delay: 0.8s;
}
#i5 #o9 {
  -moz-transform: rotate(270deg) translatex(150px);
  -moz-animation-delay: 0.9s;
  -webkit-transform: rotate(270deg) translatex(150px);
  -webkit-animation-delay: 0.9s;
}
#i5 #o10 {
  -moz-transform: rotate(300deg) translatex(150px);
  -moz-animation-delay: 1.0s;
  -webkit-transform: rotate(300deg) translatex(150px);
  -webkit-animation-delay: 1.0s;
}
#i5 #o11 {
  -moz-transform: rotate(330deg) translatex(150px);
  -moz-animation-delay: 1.1s;
  -webkit-transform: rotate(330deg) translatex(150px);
  -webkit-animation-delay: 1.1s;
}
#i5 #o12 {
  -moz-transform: rotate(0deg) translatex(150px);
  -moz-animation-delay: 1.2s;
  -webkit-transform: rotate(0deg) translatex(150px);
  -webkit-animation-delay: 1.2s;
}

/* illusion 5 */
#i6 {
    background-color: #3f023e;
    height: 640px;
    margin: 0 auto;
    overflow: hidden;
    padding-left: 120px;
    position: relative;
    width: 900px;
}

#i6 .yellow {
    background-color: #b9bd04;
    background-image: -webkit-radial-gradient(50% 50%, circle, #fff531 40%, #b9bd04 80%);
    background-image: -moz-radial-gradient(50% 50%, circle, #fff531 40%, #b9bd04 80%);
    background-image: -o-radial-gradient(50% 50%, circle, #fff531 40%, #b9bd04 80%);
    background-image: radial-gradient(50% 50%, circle, #fff531 40%, #b9bd04 80%);
}
#i6 .pink {
    background-color: #f101e8;
    background-image: -webkit-radial-gradient(50% 50%, circle, #0e0403 40%, #f101e8 80%);
    background-image: -moz-radial-gradient(50% 50%, circle, #0e0403 40%, #f101e8 80%);
    background-image: -o-radial-gradient(50% 50%, circle, #0e0403 40%, #f101e8 80%);
    background-image: radial-gradient(50% 50%, circle, #0e0403 40%, #f101e8 80%);
}
#i6 > div {
    float: left;
    height: 320px;
    position: relative;
    width: 320px;
}
#i6 .r1 {
    height: 320px;
    position: absolute;
    width: 320px;

    -webkit-border-radius: 320px;
    -moz-border-radius: 320px;
    -ms-border-radius: 320px;
    -o-border-radius: 320px;
    border-radius: 320px;
}
#i6 .r2 {
    height: 240px;
    left: 40px;
    position: absolute;
    top: 40px;
    width: 240px;

    -webkit-border-radius: 240px;
    -moz-border-radius: 240px;
    -ms-border-radius: 240px;
    -o-border-radius: 240px;
    border-radius: 240px;
}
#i6 .r3 {
    height: 160px;
    left: 40px;
    position: absolute;
    top: 40px;
    width: 160px;

    -webkit-border-radius: 160px;
    -moz-border-radius: 160px;
    -ms-border-radius: 160px;
    -o-border-radius: 160px;
    border-radius: 160px;
}
#i6 .r4 {
    height: 80px;
    left: 40px;
    position: absolute;
    top: 40px;
    width: 80px;

    -webkit-border-radius: 80px;
    -moz-border-radius: 80px;
    -ms-border-radius: 80px;
    -o-border-radius: 80px;
    border-radius: 80px;
}

this is very big pack of styles, but i hope that this is ok. i have used several different css3 techniques: and keyframe animation, and transform rotate, and sometimes – gradients.

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conclusion

hope you enjoyed the new demo. don’t forget to give thanks and leave a comment good luck!

source: http://www.script-tutorials.com/css3-optical-illusions/

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CSS3 Optical Illusions

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step 1. html

index.html

step 2. css

css/illusions.css

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