Rollup merge of #40497 - wesleywiser:fix_sidebar, r=GuillaumeGomez
Rollup merge of #40497 - wesleywiser:fix_sidebar, r=GuillaumeGomez

Fix sidebar not extending to the bottom of the page

Fixes #40459

graydon/rust,graydon/rust,graydon/rust,aidancully/rust,GBGamer/rust,graydon/rust,GBGamer/rust,aidancully/rust,aidancully/rust,GBGamer/rust,graydon/rust,GBGamer/rust,aidancully/rust,aidancully/rust,GBGamer/rust,graydon/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust