Can't change menu button background?

Question

WordPress

WordPress. Astra theme. In the mobile version, the menu button has a purple color, I can’t find this color at the root in any way to change it? A link to it through "View Code" leads to the cache of the Autooptimize plugin, there is no theme anywhere in the CSS (( mpk22.ru

Answer 1

Settings -> Autoptimize -> General (first tab) -> Show advanced settings (upper right corner) -> Other settings (bottom of the screen) -> uncheck "Optimize for registered users?" and save changes.
Now you can view CSS from under the admin through "View Code".