<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
div {
height: 100px;
line-height: 100px;
text-align: center;
}
.box1 {
background-color: red;
}
.box2 {
width: 50%;
float: left;
background-color: orange;
}
.box3 {
width: 50%;
float: left;
background-color: yellow;
}
</style>
</head>
<body>
<div class="box1">box1</div>
<div class="box2">box2</div>
<div class="box3">box3</div>
</body>
</html>
效果如下：
