<html>
<head>
<title>Bootstrap 实例</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://apps.bdimg.com/libs/bootstrap/3.3.0/css/bootstrap.min.css">
<style>
body {
position: relative;
}
#section1 {
padding-top: 50px;
height: 500px;
color: #fff;
background-color: #1E88E5;
}
#section2 {
padding-top: 50px;
height: 500px;
color: #fff;
background-color: #673ab7;
}
#section3 {
padding-top: 50px;
height: 500px;
color: #fff;
background-color: #ff9800;
}
#section41 {
padding-top: 50px;
height: 500px;
color: #fff;
background-color: #00bcd4;
}
#section42 {
padding-top: 50px;