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Div+Css(1):Div+Css中transparent制作奥运五环

<!doctype html><html lang="en"> <head>  <meta charset="UTF-8">  <title>奥运五环</title>  <style type="text/css">    body{        margin: 20px;        background-color: #efefef;    }    ul.flag{        list-style: 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>