Difficulty Changing Font Size through CSS

Hello,

I’m trying to change the font size of my <p> to no avail. It seems like this should be easy, but o well.

Anyways, the page in question is here:

http://www.drgoodvet.com/pet-pharmacy/

I’m trying to increase the size of <p> to 22px;

Also, I can’t determine where the CSS is coming from to make the font-size so small for <p>. Using Firebug (firefox) and/or Chrome’s Developer Tool, I just can’t find the rule that specifies the CSS’s font size.

My CSS (I’ve tried various configurations here):

.entry .largetext p { font-size:22px;}
.largetext p { font-size:22px!important;}
.largetext p { font-size:22px;}

My HTML:

<p class="largetext">We provide an <a href="http://drgoodvet.vetsfirstchoice.com/" target="_blank">Online Pet Pharmacy</a> fulfilled by our veterinary clinic where you can purchase your pet's medications with confidence. All of our medications are guaranteed to be authentic, drug company products. There are no counterfeits here! Our Pet Pharmacy can be your one-stop shop for all of your pet's medication needs, including:</p>