Non-transparent headers on some pages?

Site URL: http://clever.cooking

I'm wondering how I can make my header non-transparent on all but my main page? I have a graphic on the main page so transparency is perfect there, but I'd like the head to be a non-transparent solid color on the other pages. Any help would be hugely appreciated!

Add to Home > Design > Custom CSS

body:not(.homepage) header#header {
    background: red !important;
}

10 hours ago, tuanphan said:

Add to Home > Design > Custom CSS

body:not(.homepage) header#header {
    background: red !important;
}

 

Thank you!