What you should do instead of editing main.css is to make a new file in src/settings/ named nitro-tab-patch.scss and then edit main.scss by adding the line @import "/src/settings/nitro-tab-patch"; after the other settings stuff.
As SCSS is a superset of CSS, any code you've already made CAN STILL BE USED. Don't get discouraged.
What you should do instead of editing
main.cssis to make a new file insrc/settings/namednitro-tab-patch.scssand then editmain.scssby adding the line@import "/src/settings/nitro-tab-patch";after the other settings stuff.As SCSS is a superset of CSS, any code you've already made CAN STILL BE USED. Don't get discouraged.