You have a strange issue. Inside your XHTML 1.0 Strict document you have a second (&third) declaration for HTML 4.0:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">See if you can remove that and fix some of that validation up:Once we get that up to par we can see whether the code fixes itself or whether you still have errors. The CSS document does appear fine at first glance, but with those errors it is hard to tell what is going on.
Have a look at your mark-up
<div class="AccordionPanelTab style3">
<h4><strong> Seminole Wellness® Safe & Lite Pellet</strong></h4>
If you want to style the text for the tab do so using the following rules
and change your mark-up to
<div class="AccordionPanelTab">Seminole Wellness® Safe & Lite Pellet</div>
Also take note of what SnakEyez02 said.
I hope this helps.