Setting transparency causes hierarchy problems?

setting overall transparency for a div opacity causes its level to rise?
phenomenon:
No transparency:

:

excuse me, what is the cause? What is the solution?

Css
Mar.17,2022

set position location and then set z-index property


this is the desired behavior. Setting transparency will form a stack context.. For more information about stack context, please refer to this article https://philipwalton.com/arti.

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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-64f5-1ea16c8-1b50.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1ea16c8-1b50.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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