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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>
        .red {
            /* 背景颜色 */
            background-color: red;
        }
        .green {
            /* 背景颜色 */
            background-color: green;
        }
        .width {
            width: 100px;
            height: 100px;
        }
    </style>
</head>
<body>
    <div class="red   width"></div>
    <div class="green   width"></div>
    <div class="red   width"> </div>
</body>
</html>