About bootstrap centered

Novice bootstrap, doesn"t know much about this thing.
now wants to center a login-wrap in div.
used to be solved with a margin: 0 auto;, but now it doesn"t work even for a long time.



margin-left:auto;margin-right:auto;absolute.aroundabsolutez-index

Jul.07,2021

position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
margin: auto

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-64f5-1e4c708-4398e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e4c708-4398e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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