<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title></title>
<style type="text/css">
body{
color:white;
background-color:black;
margin: 0;
}
.box{
background-color:coral;
/* border: aliceblue solid 0px; */
height: 100vh;
width: 50vw;
}
</style>
</head>
<body>
<div class="box">
<p>端午节快乐!</p>
</div>
</body>
</html>
`### 问题描述
设置box,100vh,上面有空隙,这是怎么造成的。