I think you'll need a different layout approach to manage those paypal buttons.
Try this code inside a new, blank document.
<!doctype html><html><head><meta charset="utf-8"><title>HTML5 Document</title><!--[if lt IE 9]><script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script><![endif]--><style>
* {
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}
body {
padding: 0;
width: 980px;
margin: 0 auto;
background: #CFC;
color: #366;
font-family: Segoe, "Segoe UI", "DejaVu Sans", "Trebuchet MS", Verdana, sans-serif;
font-size: 100%;
}
header {
margin: 0;
padding: 0;
width: 100%;
background: #366;
}
header h1, header h2 {
display: inline;
padding: 0 22px 0 22px;
color: #CFC
}
section {
margin: 0;
padding: 0;
background: #FFF;
overflow: hidden; /**float containment**/
}
article {
clear: left;
display: block;
margin: 0;
padding: 0 12px
}
aside {
margin: 12px 0;
padding: 0 6px;
width: 33.33%; /**3 equal width columns**/
float: left;
min-height: 245px;
border-top: 8px solid #CCC;
border-bottom: 8px solid #CCC;
border-radius: 20px;
}
aside img {
float: left;
border: 1px solid #CCC;
box-shadow: 2px 2px 3px #333;
}
aside p {
text-align: right;
margin: 0;
margin-left: 115px;
padding: 0 12px;
font-size: 14px;
}
.paypal { margin-left: 190px }
footer {
clear: both;
background: #366;
color: #FFF;
text-align: center;
margin: 0;
padding: 15px;
}
</style></head><body><!--begin header--><header><h1>Sitename | </h1><h2>Some pithy slogan...</h2></header><section><article><h3>Article</h3><p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris vitae libero lacus, vel hendrerit nisi!
Maecenas quis velit nisl, volutpat viverra felis.
Vestibulum luctus mauris sed sem dapibus luctus. </p></article><!--begin 3 columns--><aside><h3>Left Aside</h3><img src="image1.jpg" alt="image 1" height="125" width="125"><!--paypal button--><form class="paypal" target="paypal" action="https://www.paypal.com/cgi-bin/webscr" method="post"><input type="hidden" name="cmd" value="_s-xclick"><input type="hidden" name="hosted_button_id" value="UHZWKYRXS2ZLE"><input type="image" src="https://www.paypalobjects.com/en_GB/i/btn/btn_cart_SM.gif" border="0" name="submit" alt="PayPal – The safer, easier way to pay online."><img alt="" border="0" src="https://www.paypalobjects.com/en_GB/i/scr/pixel.gif" width="1" height="1"></form><!--end paypal--><p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris vitae libero lacus, vel hendrerit nisi!
Maecenas quis velit nisl, volutpat viverra felis. </p></aside><aside><h3>Middle Aside</h3><img src="image1.jpg" alt="image 2" height="125" width="125"><!--paypal button--><form class="paypal" target="paypal" action="https://www.paypal.com/cgi-bin/webscr" method="post"><input type="hidden" name="cmd" value="_s-xclick"><input type="hidden" name="hosted_button_id" value="UHZWKYRXS2ZLE"><input type="image" src="https://www.paypalobjects.com/en_GB/i/btn/btn_cart_SM.gif" border="0" name="submit" alt="PayPal – The safer, easier way to pay online."><img alt="" border="0" src="https://www.paypalobjects.com/en_GB/i/scr/pixel.gif" width="1" height="1"></form><!--end paypal--><p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris vitae libero lacus, vel hendrerit nisi!
Maecenas quis velit nisl, volutpat viverra felis. </p></aside><aside><h3>Right Aside</h3><img src="image1.jpg" alt="image 3" height="125" width="125"><!--paypal button--><form class="paypal" target="paypal" action="https://www.paypal.com/cgi-bin/webscr" method="post"><input type="hidden" name="cmd" value="_s-xclick"><input type="hidden" name="hosted_button_id" value="UHZWKYRXS2ZLE"><input type="image" src="https://www.paypalobjects.com/en_GB/i/btn/btn_cart_SM.gif" border="0" name="submit" alt="PayPal – The safer, easier way to pay online."><img alt="" border="0" src="https://www.paypalobjects.com/en_GB/i/scr/pixel.gif" width="1" height="1"></form><!--end paypal--><p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris vitae libero lacus, vel hendrerit nisi!
Maecenas quis velit nisl, volutpat viverra felis. </p></aside><!--begin footer--><footer> <small>© 2013 Your Site Name. All rights reserved</small> </footer></section></body></html>
This is what it looks like in Firefox:
Nancy O.