<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>The Olympic Flag</title>
<style type="text/css" media="screen">
body {
margin:20px;
background-color:#efefef;
}
ul.flag {
list-style-type:none;
position: relative;
margin: 20px auto;
}
.flag li, .flag li:before, .flag li:after {
-webkit-border-radius: 6em;
-moz-border-radius: 6em;
border-radius: 6em;
position: absolute;
}
.flag li {
width: 12em;
height: 12em;
left: 0;
top: 0;
font-size: 1em;
}
.flag li:after {
display: block;
content: "";
top: -0.1em;
left: -0.1em;
right: -0.1em;
bottom: -0.1em;
border: solid 1.4em black;
}
.flag .blue { z-index: 10; left: 0; top: 0; }
.flag .yellow { z-index: 20; left: 6.8em; top: 5.7em; }
.flag .black { z-index: 21; left: 13.6em; top: 0; }
.flag .green { z-index: 20; left: 20.4em; top: 5.7em; }
.flag .red { z-index: 10; left: 27.2em; top: 0px; }
.flag .blue:after { border-color: blue; }
.flag .yellow:after { border-color: yellow; }
.flag .black:after { border-color: black; }
.flag .green:after { border-color: green; }
.flag .red:after { border-color: red; }
/* 蓝色压住黄色 */
.flag .blue.alt { z-index: 24; }
.flag .blue.alt,
.flag .blue.alt:before,
.flag .blue.alt:after {
border-top-color: transparent;
border-left-color: transparent;
border-bottom-color: transparent;
}
/* 黄色压住黑色 */
.flag .yellow.alt { z-index: 23; }
.flag .yellow.alt,
.flag .yellow.alt:before,
.flag .yellow.alt:after {
border-right-color: transparent;
border-left-color: transparent;
border-bottom-color: transparent;
}
/* 绿色压住黑色 */
.flag .green.alt { z-index: 23; }
.flag .green.alt,
.flag .green.alt:before,
.flag .green.alt:after {
border-top-color: transparent;
border-right-color: transparent;
border-bottom-color: transparent;
}
/* 红色压住绿色 */
.flag .red.alt { z-index: 23; }
.flag .red.alt,
.flag .red.alt:before,
.flag .red.alt:after {
border-top-color: transparent;
border-right-color: transparent;
border-left-color: transparent;
}
</style>
</head>
<body>
<ul class="flag">
<li class="blue"></li>
<li class="blue alt"></li>
<li class="yellow"></li>
<li class="yellow alt"></li>
<li class="black"></li>
<li class="green"></li>
<li class="green alt"></li>
<li class="red"></li>
<li class="red alt"></li>
</ul>
</body>
</html>
The Olympic Flag
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