Dropdown menu, change color of items in dropdown menu only

Hi I am trying to change the color of text on my dropdown menus for one of my menu items on https://annemarieofarrell.com/wordpress/. The menu item is “Your special event”. I want to change the text of the dropdown menu options to black (and keep Your special event white).

I have used the following CSS:
li.menu-your-special-event {
background: none repeat scroll 0 0 #a8ae98 !important;
border-radius: 30px !important;
width: 170px !important;
}

/*li.menu-your-special-event a {
color: #FFFFFF !important;}

The problem is that if I try to add:
background-color: #a8ae98;
I lose the border radius formatting that I have placed around “Your special event
Would you have any ideas how I could solve this? Amazing theme by the way – it is the best I have ever worked with.,