vertical-align: middle; 属性设置元素的垂直对齐方式。
可选值:
middle:把此元素放置在父元素的中部。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
*{
margin: 0;
padding: 0;
}
html,body{
height: 100%;
text-align: center;
}
/* 照片父元素前插入 */
body::after{
content: "";
display: inline-block;
height: 100%;
vertical-align: middle;
}
img{
height: 400px;
width: 400px;
vertical-align: middle;
}
</style>
</head>
<body>
<img src="./img/周冬雨.jpg" alt="周冬雨">
</body>
</html>