我的css易忘点之box-shadow

原点为基点,原点左侧为x轴负方向,值为负,右侧为正;原点下方为y轴正方向,值为正,上方为负。
官方用语:     box-shadow: 1px 2px 3px 4px #ccc inset;

来分别看一下以上六个值的含义: 
        1px  从原点开始,沿x轴正方向的长度(倘若为负值,为沿x轴负方向的长度);

        2px  从原点开始,沿y轴正方向的长度;(倘若为负值,为沿y轴负方向的长度);

        3px  阴影的模糊度,只允许为正值;

        4px  阴影扩展半径;

        #ccc  阴影颜色;

        inset  设置为内阴影(如果不写这个值,默认为外阴影);

以下为完整html页面,直接拷贝查看各个写法效果即可:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="maximum-scale=1.0,minimum-scale=1.0,user-scalable=0,width=device-width,initial-scale=1.0"/>
    <meta name="format-detection" content="telephone=no,email=no,date=no,address=no">
    <link rel="stylesheet" href="common.css">
    <title>Title</title>
    <style>
        .d1{
            width: 400px;
            height: 160px;
            /*border: 1px dotted #ccc;*/
            margin: 20px auto;
            border-radius: 8px;
            box-shadow: 17px 0px 40px 20px #ff8c1a inset;
        }
        .d2{
            width: 400px;
            height: 160px;
            /*border: 1px dotted #ccc;*/
            margin: 20px auto;
            border-radius: 8px;
            box-shadow: -5px 0px 5px 0px #ff8c1a;
        }
        .d3{
            width: 400px;
            height: 160px;
            /*border: 1px dotted #ccc;*/
            margin: 20px auto;
            border-radius: 8px;
            box-shadow: 10px 10px 5px 0px #ff8c1a;
        }
        .d4{
            width: 400px;
            height: 160px;
            /*border: 1px dotted #ccc;*/
            margin: 40px auto;
            border-radius: 8px;
            box-shadow: 0px 0px 10px 10px #ff8c1a;
        }
        .d6{
            width: 400px;
            height: 160px;
            /*border: 1px dotted #ccc;*/
            margin: 40px auto;
            border-radius: 8px;
            box-shadow: 0px 10px 10px -5px #ff8c1a inset;
        }
        .d6-inner{
            width: 400px;
            height: 160px;
            border-radius: 8px;
            box-shadow: 0px -10px 10px -5px #ff8c1a inset;
        }
    </style>
</head>
<body>
    <div class="d1"></div>
    <div class="d2"></div>
    <div class="d3"></div>
    <div class="d4"></div>
    <div class="d6">
        <div class="d6-inner"></div>
    </div>
</body>
</html>

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转载自blog.csdn.net/bettergg/article/details/80389590