Hello,
Please try this code:
.mobile-nav-shown .mobile-nav, .mobile-nav .close-block, .et-mobile-menu li > a, .et-mobile-menu li .open-child, .et-mobile-menu > li > ul > li a, .et-mobile-menu > li > ul li, .mobile-nav .search .et-mega-search form input[type="text"], .mobile-nav .mobile-nav-heading, .mobile-nav ul.links li a {
background-color: pink;
border-color: rgba(231, 227, 228, 0.74) !important;
color: black !important;
}
Regards