Fix `overscroll-behavior: contain` not working

[Legend-Master]

describe the bug/feature 解决的问题或新增的功能

https://github.com/EdgeTranslate/EdgeTranslate/assets/68118705/6ce90c66-efcf-44a4-9222-ae91607f2bbf

https://github.com/EdgeTranslate/EdgeTranslate/assets/68118705/48cf59b7-30ea-4975-9a5d-959186d82885

summary of code change 描述发生的改变

Move overscroll-behavior: contain to .simplebar-content-wrapper