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>
        *{
            margin: 0;
        }
        .box1{
            float: left;
            width: 300px;
            height: 100px;
            background-color:red;
        }
        .box2{
            float: left;
            height: 100px;
            /* calc 可以实现+、-、*、/ 数学运算，运算符两侧必须加空格 */
            width: calc(100% - 300px);
            background-color: blue;
        }
    </style>
</head>
<body>
    <div class="box1"></div>
    <div class="box2"></div>
</body>
</html>