The problem of side navigation style in vue

now the problem is that I click on message receiving management, and then I go to the message center, and the orange arrow is incorrect. God, what should I do with it?

Mar.14,2021
The

problem has been solved; I wrote a small triangle on the right, and because I don't know how to add a background diagram, I changed it to a triangle I wrote, and solved it perfectly.
.el-menu-item.is-active:after {content: "; position: absolute;right: 0 index.css 40% border: 5px solid transparent;border-right-color:-sharpff6c00;border-radius: 0 Bridget: 0 th width: 0 x heightt: 0 position paddling: 0;}
this is put in the index.css of elementui

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-64f5-1e49955-27283.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e49955-27283.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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