change colors lines above and below menu

I would like to change the color of the double lines above and below the menu bar. They are I've tried something but that did not work. The colors is #EEEEEE now and needs to become #21759B.

Anyone?

 

Paste this code in Custom CSS
Appearance > Theme Option > Styling Option > Custom CSS

Code:

.header .menu-bar {
border-top: 3px double #21759B!important;
border-bottom: 3px double #21759B!important;
}