lovecoding
/
web0715


			
				
					
						
						
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							<!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>
        .box1{
            width: 100px;
            height: 100px;
            background-color:red;
            /* margin:10px; */
            /* margin-bottom: 10px;
            margin-top:10px;
            margin-left: 10px;
            margin-right: 10px; */
        /* 外边距    上   右    下   左 */
            margin:10px 10px 10px 10px;
            /* 内边距 */
            padding:10px;
        }
        body{
            /* margin 代表外边距 */
            margin:0;
        }
        .box2{
            width: 100px;
            height: 100px;
            background-color:blue;
            /* margin-left: auto;
            margin-right: auto; */
            /*     上下 左右        */
            margin : 0 auto; 
        }
    </style>
</head>
<body>
    <div class="box1">1</div>
    <div>hello</div>

    <div class="box2"></div>
</body>
</html>