lovecoding
/
W250511


			
				
					
						
						
							123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657
							<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box {
            width: 400px;
            height: 400px;
            border: 5px solid black;
            position: relative;
            /* 设置为相对定位 */
        }

        .div1 {
            position: absolute;
            left: 0;
            top:0;
            background-color: red;
            z-index: 1; /* 设置层级  数字越大越在上面 */

        }

        .div2 {
            position: absolute;
            right: 100px;
            top: 0;
            background-color: blue;
            z-index: 2; /* 设置层级  数字越大越在上面 */
        }

        /* 分组选择器 用"，"间隔*/
        .div1,.div2 {
            width: 200px;
            height: 200px;
            /* float: left; */

            opacity: 0.5;
        }
    </style>
</head>

<body>
    <!-- 文档流 -->

    <!-- absolute fixed 元素脱离了文档流 他们旁边的元素会忽略特们 他们之前所占用的空间会被释放掉-->
    <!-- relative 不会脱离文档流 -->
    <div class="box">
        <div class="div1"></div>
        <div class="div2"></div>
        <span>hello world</span>
    </div>
</body>

</html>