css設定四角邊框

小諸葛的部落格發表於2020-12-16
原文網址 : https://blog.csdn.net/LONG_Yi_1994/article/details/111274485
CSS

1、程式碼

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>四角邊框</title>

    <style>

        body{
            display: flex;
            flex-direction: row;
            justify-content: center;
            align-items: center;
        }

        .sijiaobiankuang{
            width: 400px;
            height: 400px;
            background:
                    linear-gradient(to top, #306EEF, #306EEF) left top no-repeat,/*上左*/
                    linear-gradient(to right, #306EEF, #306EEF) left top no-repeat,/*左上*/
                    linear-gradient(to left, #306EEF, #306EEF) right top no-repeat,/*上右*/
                    linear-gradient(to bottom, #306EEF, #306EEF) right top no-repeat,/*上右*/
                    linear-gradient(to left, #306EEF, #306EEF) left bottom no-repeat,/*下左*/
                    linear-gradient(to bottom, #306EEF, #306EEF) left bottom no-repeat,/*左下*/
                    linear-gradient(to top, #306EEF, #306EEF) right bottom no-repeat,/*下右*/
                    linear-gradient(to left, #306EEF, #306EEF) right bottom no-repeat;/*右下*/
            background-size: 2px 16px, 16px 2px, 2px 16px, 16px 2px;
            background-color: rgba(36,56,128,0.21);
        }
    </style>

</head>
<body>

    <div class="sijiaobiankuang">
        <h1 style="text-align: center">Hello,小諸葛的部落格</h1>
    </div>

</body>
</html>

2、執行效果

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