@Darwin
Check:
https://www.w3schools.com/cssref/css3_pr_mediaquery.asp
and add display:none: to your div to hide in the mobile version (in selected resolution)
https://stackoverflow.com/questions/16550485/hide-div-tag-on-mobile-view-only
@Darwin Unless you love VIM and want to learn it, try "Nano" it is installed by default and works the way most of us expect an editor to work
While VIM is an excellent editor, it has it's own learning curve.