Why is the tooltip layer of ngx-bootstrap covered by the following content?

I introduced tooltip into my calendar and found that the following content will cover tooltip , but z-index of tooltip is already the highest. What"s the problem? How to solve it?

Angular5 bootstrap
Mar.18,2021
The z-index of the

child element is affected by the parent element. If there are two elements An and B, if the child element z-index of An is 999 but the z-index of An element is 1, the z-index of B is 2, then the child element of A will still be covered by B

.

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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-64f5-1b3b6e8-412d4.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3b6e8-412d4.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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