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@@ -0,0 +1,28 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+ <style>
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+ .box{
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+ width: 500px;
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+ height: 300px;
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+ border: 3px solid black;
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+ }
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+ .box1{
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+ height: 200px;
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+ background-color: red;
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+ /* calc 可以实现基础数学运算 */
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+ /* 100% 是 box 的宽度，减去 200px 就是 box1 的宽度 */
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+ /* calc 运算符号左右都需要空格 */
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+ width: calc(100% - 200px);
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+ }
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+ </style>
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+</head>
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+<body>
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+ <div class="box">
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+ <div class="box1"></div>
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+ </div>
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+</body>
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+</html>
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