


1. Horizontal centering of inline elements such as text and pictures
Set text-align:center to the parent element; you can achieve centering, for example:
< ;div class="top">
Fly Free
To realize the four words of free flying For centering, just write .top{text-align:certer;}
2. To determine the horizontal centering of wide block-level elements
, you need to set the marin attribute, which is margin: 0 auto;
For example:
3. Horizontal centering of block-level elements with uncertain widths
Sometimes the size of the block is uncertain and changes. In this case, centering cannot be achieved using the margin attribute. To achieve this, there are three methods to solve it.
(First type): After defining the block element that needs to be centered as display:table, you can use margin to center it. For example:
The number of li is uncertain, and the width of ul cannot be determined. To achieve centering, .footer ul{display:table;margin:0 auto;}
(second type) should be written in the style : Convert block elements to inline elements
and write .footer ul{display:inline;text-align:center;}
in the style. At this time, li should also change.footer ul li{display:inline;}
(Third method): Use relative positioning. This method is especially suitable when uploading images of different sizes but needs to be centered.
Follow the above example to achieve centering, you need to write .footer {position:relative; left:50%;} in the style
At this time li should also be converted into an inline element.

The official account web page update cache, this thing is simple and simple, and it is complicated enough to drink a pot of it. You worked hard to update the official account article, but the user still opened the old version. Who can bear the taste? In this article, let’s take a look at the twists and turns behind this and how to solve this problem gracefully. After reading it, you can easily deal with various caching problems, allowing your users to always experience the freshest content. Let’s talk about the basics first. To put it bluntly, in order to improve access speed, the browser or server stores some static resources (such as pictures, CSS, JS) or page content. Next time you access it, you can directly retrieve it from the cache without having to download it again, and it is naturally fast. But this thing is also a double-edged sword. The new version is online,

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