Pure css3 achieve triangle and the triangle bordered

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code show as below
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>

    <style>
        .top-san {
            width: 0;
            height: 0;
            border-left: 50px solid transparent;
            border-right: 50px solid transparent;
            border-bottom: 100px solid #ff0066;
            margin-bottom: 10px;
        }

        .bottom-san {
            width: 0;
            height: 0;
            border-left: 50px solid transparent;
            border-right: 50px solid transparent;
            border-top: 100px solid red;
        }

        .left-san {
            width: 0;
            height: 0;
            border-top: 50px solid transparent;
            border-right: 100px solid #0066ff;
            border-bottom: 50px solid transparent;
        }

        .right-san {
            width: 0;
            height: 0;
            border-top: 50px solid transparent;
            border-left: 100px solid #333;
            border-bottom: 50px solid transparent;
        }

        #demo {
            width: 0;
            height: 0;
            position: relative;
            border-top: solid 50px transparent;
            border-right: solid 50px black;
            /* 黑色大三角形 */
            border-bottom: solid 50px transparent;
        }

        #demo:after {
            content: "";
            width: 0;
            height: 0;
            position: absolute;
            left: 3px;
            top: -45px;
            border-top: solid 45px transparent;
            border-right: solid 45px white;
            /* 白色小三角形 */
            border-bottom: solid 45px transparent;
        }
    </style>
</head>

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

    <div id="demo"></div>


</body>

</html>
Pure css3 achieve triangle and the triangle bordered

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