After setting up the mobile version of the site on WordPress, did all the settings for the desktop version fly?

Question

WordPress

I changed the settings of widgets and css for the mobile version of the site, but all the settings flew off on the desktop version as well. How to separate settings for mobile and PC version?

Answer 1

@media all and (max-width:676px){
Тут CSS содержимое для телефонов
}