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Creating Triangles in CSS
http://jonrohan.me/guide/css/creating-triangles-in-css/

<!DOCTYPE html>

<html lang="zh-CN">

<head>

    <meta charset="utf-8">

    <title></title>

    <style>

        .wrap {

            width: 100px;

            background: #F00;

        }

        .box {

            margin-bottom: 10px;

            margin-right: auto;

            margin-left: auto;

        }

        .box-1 {

            border-width: 6px;

            border-style: solid;

            border-color: #FF0;

        }

        .box-2 {

            border-width: 6px;

            border-style: solid dashed;

            border-color: #FF0 transparent;

        }

        .box-3 {

            border-width: 6px 6px 0;

            border-style: solid dashed;

            border-color: #FF0 transparent;

        }

        .box-4 {

            width: 0;

            height: 0;

            overflow: hidden;

            border-width: 6px 6px 0;

            border-style: solid dashed;

            border-color: #FF0 transparent;

        }

    </style>

</head>

<body>

    <div class="wrap">

        <div class="box box-1"></div>

        <div class="box box-2"></div>

        <div class="box box-3"></div>

        <div class="box box-4"></div>

    </div>

</body>

</html>

 

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