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[转]css父元素背景覆盖其子元素背景，正常一般是子元素的背景会覆盖父元素的背景

原文：https://www.cnblogs.com/zouqin/p/5498495.html

问题：怎么实现父元素的背景覆盖子元素的背景呢？

————————————————————————————

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
        <style>
 
            .test1{
                width: 100px;
                height: 100px;
                border: 1px solid green;
                background: green;
                position: absolute;
                z-index: auto;
            }
 
            .test2{
                width: 100px;
                height: 100px;
                border: 1px solid black;
                background: black;
                position: relative;
                left: 20px;
                top: -20px;
                z-index: -1;
            }
        </style>
    </head>
    <body>
        <div class="test1">
            <div class="test2"></div>
 
        </div>
 
    </body>
</html>