CSS:如何直接将div元素居中居中? [英] css: how to center box div element directly in center?

问题描述

当我使用top:50％和left:50％

when i use top:50% and left:50%

该框不直接位于中间.当然，当盒子很小时，它似乎居中.但是当盒子有点大时，看起来好像没有居中.

the box is not directly in center. of course when the box is very small, it appears to be centered. but when box is a bit big, it looks as if it's not centered.

我该如何解决?

推荐答案

top 和 left 对应于框的左上角.您正在尝试做的是让它们与中心相对应.因此，如果将 margin-top 和 margin-left 分别设置为高度和宽度的一半的负数，则会得到一个居中的框.

top and left correspond to the top-left corner of your box. What you're trying to do is have them correspond to the center. So if you set margin-top and margin-left to negative of one-half the height and width respectively, you'll get a centered box.

300x200框的示例:

Example for a 300x200 box:

width: 300px;
height: 200px;
top: 50%;
left: 50%;
margin-left: -150px;
margin-top: -100px;

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