How to select the background color of a subitem in the less modify ng-alain left menu bar

how to select sub-item background color in less modify ng-alain left menu bar
in this built-in component
< sidebar-nav > < / sidebar-nav >

May.20,2022
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-64f5-1b2ae3b-2ba40.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b2ae3b-2ba40.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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