css-super/border-linear at master · fareise/css-super · GitHub

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<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="utf-8" />
    <title></title>
    <style>
        .box {
            margin: 80px 30px;
            width: 200px;
            height: 200px;
            position: relative;
            background: #fff;
            float: left;
        }

            .box:before {
                content: '';
                z-index: -1;
                position: absolute;
                width: 220px;
                height: 220px;
                top: -10px;
                left: -10px;
            }

        .first:before {
            background-image: linear-gradient(90deg, yellow, gold);
        }

        .second:before {
            background-image: linear-gradient(0deg, orange, red);
        }

        .third:before {
            background-image: repeating-linear-gradient(-45deg,#cc2a2d,#cc2a2d 30px,#f2f2f2 30px,#f2f2f2 40px,#0e71bb 40px,#0e71bb 70px,#f2f2f2 70px,#f2f2f2 80px);
        }
    </style>
</head>
<body>
    <div class="box first"></div>
    <div class="box second"></div>
    <div class="box third"></div>
</body>
</html>