<!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 {
width: 100px;
height: 100px;
background-color: red;
}
.green {
width: 100px;
height: 100px;
background-color: green;
}
</style>
</head>
<body>
<div class="red">123</div>
<div class="green">456</div>
<div class="red">789</div>
</body>
</html>
本文展示了如何使用HTML和CSS创建一个包含红色和绿色div元素的简单布局,每个div元素都有各自的宽度和背景颜色。
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