How css centers a single line of text vertically in a container

This article mainly introduces how css makes single-line text center vertically in the container. It is very detailed and has a certain reference value. Friends who are interested must finish reading it!

Specific code:

# test {height:25px;line-height:25px;} / * just set the line height of the text to be equal to the height of the container * the basic syntax of css is: 1, the css rule consists of a selector and one or more declarations; 2, the selector is usually a HTML element that needs to be changed; 3, each declaration is composed of an attribute and a value; 4, attributes and attribute values are separated by colons.

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