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Current CSS within your product descriptions
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<style><!--
 #header {
 background-color:#0B5694;
 color:white;
 text-align:center;
 padding:5px;
 }
 #nav {
 line-height:30px;
 background-color:#eeeeee;

 width:400px;
 float:left;
 padding:5px;
 }
 #section {
 width:370px;
 float:left;
 padding:10px;
 }
 #footer {
 background-color:#0B5694;
 color:white;
 clear:both;
 text-align:center;
 padding:5px;
--></style>
Updated Product Description CSS
This is the CSS I've applied globally, however, if you were to replace the existing CSS with the following code within the long description of every product, the preview would look correct.
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Code that would need to be replaced.

<style>
.pro-header {
  background-color: #0B5694;
  text-align: center;
  padding: 5px }

.pro-header h1 {
  color: #fff !important }

.pro-nav {
  background-color: #eeeeee;
  width: 400px;
  float: left;
  padding: 5px }
 
.pro-section {
 width: 370px;
 float: left;
 padding: 10px }
 
.pro-footer {
 background-color: #0B5694;
 color: #fff;
 clear: both;
 text-align: center;
 padding: 5px }
</style>