斜线布局

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>斜线布局</title>
    <style>

    .x {
        border: solid 1px red;
        width: 100px;
        height: 100px;
        position: relative;
        background-color: transparent;
    }

    .x:before {
        position: absolute;
        top: 0px;
        right: 0;
        left: 0;
        bottom: 0;
        border-bottom: 100px solid red;
        border-left: 100px solid transparent;
        content: "";
    }

    .x:after {
        position: absolute;
        left: 1px;
        right: 0;
        top: 1px;
        bottom: 0;
        border-bottom: 99px solid white;
        border-left: 99px solid transparent;
        content: "";
    }

    .f {
        border: solid 1px red;
        width: 100px;
        height: 100px;
        position: relative;
        background-color: transparent;
    }

    .f:before {
        position: absolute;
        top: 0px;
        right: 0;
        left: 0;
        bottom: 0;
        border-bottom: 100px solid red;
        border-right: 100px solid transparent;
        content: "";
    }

    .f:after {
        position: absolute;
        left: 0;
        right: 1px;
        top: 1px;
        bottom: 0;
        border-bottom: 99px solid white;
        border-right: 99px solid transparent;
        content: "";
    }
</style>
</head>
<body>
     <div class="x"> </div>
</body>
</html>

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原文地址：https://www.cnblogs.com/heyiming/p/6439157.html