<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>居中布局一</title><style>.parent{width: 200px;height: 600px;background-color: pink;position: relative;}.child{width: 200px;height: 200px;background-color: red;position: absolute;top: 50%;transform: translateY(-50%);}</style>
</head>
<body><div class="parent"><div class="child">我是歌谣</div></div>
</body>
</html>运行结果
