html文件
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<div class="father">
<div class="child">
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</div>
</div>
</body>
</html>
1.使用CSS方法
.father {
text-align: center;
border: 1px solid black;
}
.child {
display: inline-block;
vertical-align: middle;
border: 1px solid black;
}
效果图
2.使用CSS3 transform:
.father {
position: relative;
border: 1px solid black;
}
.child {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
border: 1px solid black;
}
效果图
