Custom code to change mobile menu colors? (text + background)

Site URL: http://www.steveworkedonit.com

Hi there. Hoping someone might be able to provide an answer on this one. 

I've been trying to change the background color/font color for my mobile menu drop down (mobile shows blue background/ white text0. Trying to have it match the desktop version (white background w/ blue text). I tried messing with some custom CSS / site styles based on previous posts, but have had no luck. Can anyone shed some light on this? Thanks!

Site was made using Squarespace 7.0

Add to Design > Custom CSS

@media only screen and (max-width:800px) {
div#mobileNav {
    background-color: white;
}
div#mobileNav * {
    color: #1259a1 !important;
}}