* Remove padding around the footer
* Use CSS container queries instead of media queries on the full window
Container queries are supported by 92.76% of web users, which can be an issue.
https://caniuse.com/css-container-queries
Though we do use them in other places
* Use `@supports` to check if `@container` can be used and use mixins
* Add the max sidebar width the fallback media query
* Update the footer responsiveness so we don't affect the default variant
GitOrigin-RevId: bed3e4244f1a97fd84740dcf87fb27c760be91ad
b165e71ba9