后台布局

<div><i class="fa fa-envelope-o " aria-hidden="true"></i></div> //在awesome内提供标签名
2. border-radius 实现变圆
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
      <link rel="stylesheet" href="../css/font-awesome.min.css"/>
    <style>
        .pg-header{
            height: 48px;
            line-height: 48px;
            background-color: #00a4ef;

        }
        .pg-header .logo{
            width: 200px;
            height: 48px;
            line-height: 48px;
            text-align: center;
            background-color: #303030;
            color: white;

        }
        .pg-header .user{
            margin-right: 60px;
            padding: 0 20px;
            color: white;
            height: 48px;
        }
        .pg-header .user:hover{
            background-color: #dddddd;
        }
        .pg-header .user .a .image{
            padding-top: 4px;
            width: 30px;
            height: 40px;
            border-radius: 50%;

        }
        .pg-header .user .b{
            position: absolute;
            top:70%;
            left: 0;

            z-index:20;
            color: white;
            display: none;
        }
        .pg-header .user:hover .b{
            display: block;
        }

        .pg-header .user .b a{
            display: block;
        }
        .pg-header .icon{
            padding: 0 20px;

        }
        .pg-header .icon:hover{
            background-color: #dddddd;
        }

        .left{
            float: left;
        }
        .right{
            float: right;
        }
        .pg-content .menu{
            position: absolute;
            width: 200px;
            left: 0;
            top: 48px;
            bottom: 0;
            background-color: #dddddd;
            min-width: 100px;


        }
        .pg-content .content{
            z-index : 10;
            position: absolute;
            left: 200px;
            right: 0;
            top: 48px;
            bottom: 0;
            background-color: #303030;
            overflow: auto;

        }
        body {
            margin: 0 auto;
        }
    </style>
</head>
<body>
    <div class="pg-header">
        <div class="logo left">老男孩</div>
        <div class="user right" style="position: relative">
            <div>
                 <a class="a" href="#">
                     <image class='image' src="1.jpg"></image>
                 </a>
                 <div class="b">
                     <a >我的资料</a>
                     <a >注册</a>
                 </div>
            </div>
        </div>
        <div class="icon right">
              <i class="fa fa-bell-o" aria-hidden="true"></i>
              <span style="display: inline-block;
                          background-color: red;
                          border-radius: 50%;
                          width: 30px;
                          line-height: 30px;
                          height: 30px;
                          text-align: center">5</span>

        </div>
        <div class="icon right"><i class="fa fa-envelope-o " aria-hidden="true"></i></div>


    </div>
    <div class="pg-content">
        <div class="menu left">a</div>
        <div class="content left">f</div>
    </div>

</body>
</html>
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