<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
body{
/*去掉最顶部间距*/
margin: 0;
}
.left{
float: left;
}
.right{
float: right;
}
.pg-header{
height: 48px;
background-color: #2459a2;
color: white;
/*line-height值等于div高度使文字垂直居中*/
line-height: 48px;
}
.pg-header .logo{
width: 200px;
background-color: cadetblue;
text-align: center;
}
.pg-header .user{
/*width: 160px;*/
height: 48px;
/*background-color: wheat;*/
position: relative;
color: white;
margin-right: 60px;
padding: 0 20px;
}
.pg-header .user:hover{
background-color: blue;
}
.pg-header .user .a img{
height: 40px;
width: 40px;
margin-top: 4px;
margin-left: 4px;
border-radius: 50%
}
.pg-header .user .b{
position: absolute;
top: 48px;
right: 44px;
background-color: white;
z-index: 20;
width: 160px;
/*b默认不显示*/
display: none;
}
/*当鼠标放在user上的时候b就显示出来*/
.pg-header .user:hover .b{
display: block;
}
.pg-header .user .b a{
display: block;
color: black;
/*去掉a标签的下划线*/
text-decoration: none;
}
/*左侧菜单跟随滚动条*/
.pg-content .menu{
/*absolute定位会随着滚动条滑动而滑动，fixed不会随滚动条滑动而滑动，relative单独使用没用*/
position: absolute;
top:48px;
left: 0;
bottom: 0;
width: 200px;
background-color: #dddddd;
}
.pg-content .content{
/*使用absolute，当内容较多时，一屏之后的数据就没有背景色，可将该内容用一个div包裹起来加背景色解决*/
position: absolute;
top: 48px;
right: 0;
bottom: 0;
left: 200px;
/*当屏幕缩小到最小宽度后会出现滚动条滑动查看横向内容*/
min-width: 500px;
/*background-color: purple;*/
/*加了overflow: auto;后当内容太多时会出现滚动条，当 position: absolute;时加了overflow: auto;左侧菜单及header
不跟随滚动条滚动，不加就跟随滚动条滚动*/
overflow: auto;
z-index: 9;
}
</style>
</head>
<body>
<div class="pg-header">
<div class="logo left">
hello
</div>
<div class="user right">
<a class="a" href="#">
<img src="可领取右下角.png">
</a>
<div class="b">
<a href="#">我的资料</a>
<a href="#">注销</a>
</div>
</div>
</div>
<div class="pg-content">
<div class="menu left">q</div>
<div class="content left">
<div style="background-color:purple;">
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</div>
</div>
</div>
<div class="pg-footer"></div>
</body>
</html>
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