Change main menu color on Catch evolution theme

I Use WordPress 4.7.2–fr_FR, with « Catch evolution free «  theme I want to change the color of the first (header ) and the second line menu I add in the Custom CSS box the following code copied in this forum. I don’t have a new menu color !! Is it possible to change menu color with Catch evolution ? Where I can find a documentation about menu and color change ? Thanks for your help !

/* Nav menu color and background color on hover/focus */
#header-top .nav-header-top .clean-journal-nav-menu li:hover > a, #header-top .nav-header-top .clean-journal-nav-menu li > a:focus {
    background-color: #C81414;
    color: #fff;
}
/* Active Nav menu item color and background color */
.nav-header-top .clean-journal-nav-menu li.menu-item.current-menu-item > a, .nav-header-top .clean-journal-nav-menu li.menu-item.current-menu-ancestor > a {
    background-color: #C81414;
}