Create Nav Menu CTA Button

I'm trying to style a menu item in the header primary nav. I'd like for the 'Sale' menu item to be styled red but my knowledge is a bit limited!

I've added a CSS class to the menu item and applied the following CSS to turn the text red.

.Menu-Sale-CTA {
color: #red !important;
}

but it's not working. I'm sure it's something simple - any ideas?