<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<style>
div{
width:300px;
height:70px;
border:1px solid red;
font-size:30px;
line-height:70px;
vertical-align:middle;
text-align:center;
padding:0px;
margin:0px;
}
</style>
</head>
<body>
<div>
hello world
</div>
</body>
</html>
the effect is as follows:
ling-height = divheight
vertical-align:middle;
you limit div to death. If p spills over, of course it's not centered.
if you change the div in css to p, you will center
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<style>
p{
width:300px;
height:70px;
border:1px solid red;
font-size:30px;
line-height:70px;
vertical-align:middle;
text-align:center;
padding:0px;
margin:0px;
}
</style>
</head>
<body>
<div>
hello world
</div>
</body>
</html>text is based on line height. Line-height:70px;, if you remove the default inner and outer margins, the distance you mark should be about 35
parent:
display: table-cell;
vertical-align: middle;
height: 65px;
width: 65px;Child:
display: inline-block;
vertical-align: middle; see that so many gods have given you an answer, and you haven't adopted it yet. I've decided to have an ultimate answer.
and look at the picture:
divdiv
ppchromemargin1em;
1emem
font-size1emfont-size35pxmarginmargin35px;
:pfont-size,p35px
marginOK
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