In the CSS inserts, I've set the background color of the menu to transparent because otherwise the background color interferes with the header image.
My problem is that when that is set to transparent I can't set the background color of the submenu. It's defaulting to white & I want it the grey color that's behind the menu.

The URL is www.mountainhcs.net.

Even setting the border to 0 around the menu (in the ATO) doesn't get rid of the color that's covering up the header image, so I just can't find the right combination of things to get it right.

Here's what I have in the snippets:

/* ================================================ */
/* Page Menu item */
/* ================================================ */
ul.rMenu li a:link,
ul.rMenu li a:visited,
ul.rMenu li a:hover,
ul.rMenu li a:active,
ul.rMenu li {
background: transparent !important;
padding-right: 15px;
}

div#menu1 ul.rMenu li a:link {font-weight: bold;}
div#menu1 ul.rMenu li a:hover {font-weight: bold;}
div#menu1 ul.rMenu li a:visited {font-weight: bold;}
div#menu1 ul.rMenu li a:active {font-weight: bold;}

Thank you!

Here is some code that should get you started.

.sub-menu {
    background: #ddd !important;
}
.sub-menu a:hover {
    color: #000 !important;
}
.sub-menu a:link {
    color: #fff !important;
}

Awesome, worked perfectly, thank you!!