< el-footer > of the Vue Element-Ui Container layout container: why does the bottom column container always sink to the bottom?

When

Element-Ui uses Container layout container, when < el-main >: the main area container content is too little, how to make < el-footer >: bottom column container sink all the time?

Feb.16,2022

set location
Preview:

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e48ea6-59d3f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e48ea6-59d3f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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