Hi Trey,
If you used custom CSS without @media rule it will be used on all views, also Mobile and Tablet view. It's a normal browser (for all browsers!) behavior.
If you want to use selected style for Desktop view only it should be used like that
@media screen and (min-with: 1024px) {
HERE-ADD-CSS-CODE-FOR-DESKTOP-VIEW-ONLY
}
OR for MOBILE ONLY
@media screen and (max-with: 780px) {
HERE-ADD-CSS-CODE-FOR-MOBILE-VIEW-ONLY
}
Do you understand now? More detailed guides you can find on YT, Google, Bing etc..