CSS效果

1.使用div绘制图形（三角形）？

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .triangle-top {
            width: 0;
            height: 0;
            border-width: 0 40px 40px;
            border-style: solid;
            border-color: transparent transparent red;
        }

        .triangle-bottom {
            width: 0;
            height: 0;
            border-style: solid;
            border-width: 40px 40px 0 40px;
            border-color: blueviolet transparent transparent transparent;
        }

        .triangle-left {
            width: 0;
            height: 0;
            border-style: solid;
            border-width: 40px 0 40px 40px;
            border-color: transparent transparent transparent #89ff56;
        }

        .triangle-right {
            width: 0;
            height: 0;
            border-style: solid;
            border-width: 40px 40px 40px 0;
            border-color: transparent yellowgreen transparent;
        }


        /*缺口的三角形*/
        .box{
            position: absolute;
            left: 0;
            top: 0;
            width: 0;
            height:0;
            border: 6px solid transparent;
        }
        .b1{
            /*底层的盒子三角形相当于全部是黑色的*/
            border-bottom-color:#000 ;
        }
        .b2{
            /*上层的为白色覆盖*/
            border-bottom-color:#fff ;
        }
    </style>
</head>
<body>

<div class="triangle-top"></div>
<div class="triangle-bottom"></div>
<div class="triangle-left"></div>
<div class="triangle-right"></div>

<div class="box b1"></div>
<div class="box b2"></div>
</body>
</html><!DOCTYPE html>
<htm

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