You could do something like this:
.topbar a:link,
.topbar a:hover,
.topbar a:active,
.topbar a:visited {
color:#f00 !important;
}
which should set those links to red (probably not the color you want to use, but you get the idea). Just make sure you throw in the !important to enforce it over anything else.
Alternatively, you could try adding the following rule to your CSS:
.topbar {
background:rgba(0,0,0,0.5);
}
This will give it a semi-transparent black background.