border color submenu

Hi!

can You help me please with the border color of the submenu items. right now it is black. (i want it to be #dadada)
trying to replace “solid black” with “#dadada” makes the boarder disappear…. this is what i have in quick css.:
________________________
.header-scrolled #header_main_alternate {
border-bottom: 1px solid black;
}

@media only screen and (max-width: 990px) {
#header { border-bottom: 1px solid black; }}

.av-main-nav > li > ul {
border-top-width: 2px!important;
border-top-style: solid;
border: 1px solid black;
}

#top .av-main-nav ul ul { border: 1px solid black; }
________________________

Thanks alot!

Regards,
finlando