bootstrap remove upward arrow in dropdown

Question

I am using Twitter bootstap and wish to remove the upward arrow on the dropdown-menu whis is in my nav. I cannot find a reference in the bootstrap.css.

Answer 1

The following css worked for me:

.dropdown-menu:before, 
.dropdown-menu:after {
     border: none !important;
     content: none !important;
}

If you remove any of the two selectors, some detail from the arrow would still remain - either a gray or a white triangle.

(Just decided to add this in case someone is looking for an answer later, as the accepted answer didn't work for me.)