vh100，顶部为什么有空隙呢？
<!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。
回答
<!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;
}
.fix-margin:before {
content:'200B';
display:block;
height:0;
visibility:hidden;
}
.box{
background-color:coral;
/* border: aliceblue solid 0px; */
height: 100vh;
width: 50vw;
}
</style>
</head>
<body>
<div class="box fix-margin">
<p>端午节快乐！</p>
</div>
</body>
html, body {margin:0;padding:0;}因为 p 标签默认有 margin-top 和 margin-bottom, 如果你想避免这种情况可以查查 reset.css 
<!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">
html, body{
color:white;
background-color:black;
margin: 0;
padding: 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>
以上是 vh100，顶部为什么有空隙呢？ 的全部内容， 来源链接： utcz.com/a/27136.html
