Hello,

To change the background color of mobile menu, please add this code into your custom css box:

@media (max-width: 480px){
header#header .container {
    background-color: azure !important;
}}

Best regards!

Hello,

Please edit the above code to this:

@media (max-width: 480px){
header#header {
    background-color: azure !important;
}}

Best regards!