老师我按照视频里完成的，为什么实现不了，BODY的背景色都没设上去

来源：3-2 表示层--导航的实现

CloveZ

2019-04-22 21:57:56

<!DOCTYPE html>
<html>
<head>
   <meta charset="UTF-8">
   <title>云南相册</title>
   <link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
   <span></span>
   <nav>
       <a href="#">阿达达斯</a>
       <a href="#">达斯阿萨德</a>
       <a href="#">大扫荡</a>
       <a href="#">大大</a>
       <a href="#">佛挡杀佛</a>
       <a href="#">猜必须从</a>
       <a href="#">方式</a>
       <a href="#">是否胜多方式</a>
       <a href="#">方式发多少</a>
       <a href="#">行驶证猜</a>
       <a href="#">都被你们好</a>
       <a href="#">大大</a>
   </nav>
</body>
</html>

*｛
margin:0;
paddingh:0;
border:none;
｝

html,
body {
   height: 100%;
    background:blue;
}

span{
   display: block;
   width: 16px;
   height: 16px;
   margin:30px auto 40px;
   border-radius: 50%;
   background:#999;
}

nav{
   position: relative;
   display: flex;
   width: 78.125vw;
   margin:0 auto 45px;
   justify-content: space-between;

}

nav:before {
position:absolute;
top: 20px;
width: 100%;
height: 10px;
background: :#999;
display: block;
content: "";

}

nav > a {
   position: relative;
   font-size: 13px;padding: 10px;border: 2px solid #5395b4;
   color:#255d7e;
   text-decoration:none;
   background: #fff;
}