1.基础的页面
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>网页</title>
</head>
<body>
<div class="aa" style="background: red;">
<div class="bb" style="background: blue;">bb</div>
<div class="cc" style="background: grey;">cc</div>
</div>
</body>
</html>效果图：
2.去除缝隙
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>网页</title>
<style>
body {
margin: 0px;
}
</style>
</head>
<body>
<div class="aa" style="background: red;">
<div class="bb" style="background: blue;">bb</div>
<div class="cc" style="background: grey;">cc</div>
</div>
</body>
</html>加上：
<style>
body {
margin: 0px;
}
</style>效果图：
3.网页
<!DOCTYPE html>
<html lang="en" >
<head>
<meta charset="UTF-8">
<title>网页</title>
<style>
html,body{ /*这两个都要设置成100%，后面div再设置比例才有效果*/
height: 100%;
}
body {
margin-top:0px;
margin-left: 380px;
height: 100%;
}
</style>
</head>
<body>
<div class="aa" style="background: grey;width: 600px;height: 100%">
<div class="bb" style="background: blue;">bb</div>
<div class="cc" style="background: red;">cc</div>
</div>
</body>
</html>效果图：
