If you're wondering why there's an extra border, it could be due to the a
tag overflowing into the space between images. One solution is to remove the spaces like this:
<a href="http://hornethq.lynchburg.edu/"><img class="announcement" src="../resources/images/headers/20150723announcement.png"></a>
<a href="http://hornethq.lynchburg.edu/"><img class="announcement" src="../resources/images/headers/20150723announcement.png"></a>
<a href="http://hornethq.lynchburg.edu/"><img class="announcement" src="../resources/images/headers/20150723announcement.png"></a>
Another option is to adjust the CSS
for your a
tags with either:
a { display: inline-block; }
or:
a { text-decoration: none; }
This should help in removing any unwanted underlines or borders.