How to change the color of the Drop Down menu?

[mxrqcg]

I have the fxmedia theme and my dropdown menu is transparent but I cant change it to a solid color. Pls help

  

[Shadab_dev]

Check the theme settings. Please do always send your store url along with your query when asking questions.

Thanks

[mxrqcg]

I cant find it in the Theme Settings 
the url is: https://llumir.com

[Shadab_dev]

In your base.css file in your theme code editor add this at the very bottom 

details[open]>.header__submenu {

background: red;

}

Change red to any color you need. Hope this helps