页面布局之--导航栏功能

导航样式
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        body{
            margin: 0;
        }
        .left{
            float: left;
        }
        .right{
            float: right;
        }
        .pg-header{
            height: 48px;
            background-color: #2459a2;
            color: #f5f5f5;
            min- 1180px;
            line-height: 48px;
        }

        .pg-header .logo{
             200px;
            background-color: #000795;
            text-align: center;
        }
        .pg-header .user{
            margin-right: 80px;
            padding: 0 20px;
            height: 48px;
            position: relative;
        }

        .pg-header .user:hover .userinfo{
            display: block;
        }
        .pg-header .user .userinfo{
            z-index: 20;
            position: absolute;
            top: 48px;
            right: 0;
             160px;
            background-color: #cccccc;
            color: black;
            display: none;
        }

        .pg-header .user .userinfo a{
            display: block;
        }

        .pg-header .user:hover{
            background-color: dodgerblue;
        }

        .pg-header .user .headimg img{
             40px;
            height: 40px;
            margin-top: 4px;
            border-radius: 50%
        }

    </style>
</head>
<body>
    <div class="pg-header">
        <div class="logo left">
            叨客厨子
        </div>

        <div class="user right">
            <a class="headimg" href="#">
                <img src="tt.jpg" alt="">
            </a>
            <div class="userinfo">
                <a href="">个人信息</a>
                <a href="">通知</a>
                <a href="">关注</a>
                <a href="">注销</a>
            </div>
        </div>
    </div>
    <div class="pg-footer"></div>
</body>
</html>