How can I change the category background in the mobile version?

[Lilly (Lillian)]

if you want to use specific colors not in the palette that will change with dark light, you can use the color definitions tab in the same component:

$bg-light: aqua;
$bg-dark: blueviolet;

:root {
  --category-id-4-background: #{dark-light-choose($bg-light, $bg-dark)};
}