I am trying to build a web app using as starting point the sample ASP.NET Web Application that VS2010 makes available in the Add Projects. Specifically, I am trying to use the tabbed menu, and change its behavior from the default. In particular, I am trying to change the tab colors. Well, this works in the designer. I can make the tab background white and the foreground red, but when I run the app it displays the tabs in the original drab colors. It is ignoring the changes I am making to the stylesheet, in other words. Or so it appears at least. Is there something I am missing here?
What I want is here:

This is what I get, despite my changes to stylesheet:

Here is the modified CSS element, which the designer is conforming to, but at run time is being ignored apparently:
div.menu ul li a, div.menu ul li a:visited
{
background-color: #ffffff;
border: 1px #4e667d solid;
color: #ff0000;
display: block;
line-height: 1.35em;
padding: 4px 20px;
text-decoration: none;
white-space: nowrap;
}
I am stumped.
Have you tried refreshing the browser/ clearing the cache?