I don't know much at all about html. I do know that the snippet I'm using which someone gave me, has looked the same in several themes I've tried. But here's a case where they look different. The first image is the code in a Freestack Theme Stacks 2 page and the second is the code in an Infinite Them Stacks 2 page.
Here is the code itself - pasted identically into both themes:
<input type='hidden' name='list' value='TN Grass Fed Newsletter'/>
<input type='hidden' name='redirect-success' value='http://www.tennesseegrassfed.com/newslettersuccess.html'/>
<b>Please sign up to get the latest news,</b>
<b>and special offers from Tennessee Grass-Fed Beef</b>
<b>by entering your email address below, clicking on the appropriate buttons, and then checking your mailbox for a confirmation letter.</b><br/></b>
<input type='text' name='email'/><br/>
<input class='radio' type='radio' name='action' value='add' checked='checked'/> Subscribe
<input class='radio' type='radio' name='action' value='delete'/> Unsubscribe<br/>
<input type='submit' value='Subscribe/Unsubscribe'/><br/>
<b>Please note that we will NEVER sell, rent, or share your email address</b>
Can anyone help me figure out what the problem is?
Thanks as usual.