What is the principle of the vertical center of the css?

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Javascript front-end css
Mar.15,2021

according to the way you write it in your picture, you can put content behind floater.
https://jsfiddle.net/23o0yxLf/
center principle is to count, for example, the parent element is high a, and the child element is high b. To center the child element vertically, how far is the top of the child element from the top of the parent element (b

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MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3a022-2c1d6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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