Change Desktop Menu Bar color

I would like to change the color of the desktop menu bar that appears when scrolling down. It is blue by default.

I can change the background, text and hover using this CCS code:

.main-navigation ul li a:hover, .main-navigation ul li.current_page_item > a, .main-navigation ul li.current-menu-item > a, .main-navigation ul li.current_page_ancestor > a, .main-navigation ul li.current-menu-ancestor > a {
color: #ff0000 !important;
}

.main-navigation a {
color: #fff000 !important;
}
.main-navigation ul li a:hover, .main-navigation ul li.current_page_item > a, .main-navigation ul li.current-menu-item > a, .main-navigation ul li.current_page_ancestor > a, .main-navigation ul li.current-menu-ancestor > a {
color: #ff0000 !important;
}

Any idea?

Thank you!