Quote from Snowie Stormflower;1166264:
This would still make large posts from people with lots of pets because it appears to stretch the signature..
It is the way it is now so people wouldn't have full-page signatures.
That should already be handled by the overflow:hidden on the signaturecontainer div below there. Do you have an example of someone?
Actually, I think your sequence may be out of whack, it should be like this;
[HTML]<div class="after_content"> <!-- Clear goes here -->
<div style="width:100%; max-height: 300px;"> <!-- Limits go here -->
<div>Actual signature</div> <!-- Overflow rules go here to be constrained by above -->
[/HTML]
Right now both your overflow and size are on the same div, but overflow isn't inherited so the div that actually contains the signature has no limits when the whitespace is removed from the userinfo block.