This is what your HTML source is displaying:
HTML Code:
<!--// bof: sslbox //-->
<div class="rightBoxContainer" id="sslbox" style="width: 150px">
<h3 class="rightBoxHeading" id="sslboxHeading">Secure & Certified</h3>
<div id="sslboxContent" class="sideBoxContent"><p></p><script language="Javascript" src="https://seal.godaddy.com/getSeal?sealID=78594743004b11cf3127116f3894fba17f4706340550374667762788"></script></div></div>
<!--// eof: sslbox //-->
So the id for your sidebox is sslbox, and you can apply whatever styling you need to its contents by using #sslbox {}, #sslboxHeading {} and #sslboxContent {}.
P.S. - I don't know if you were aware that anyone who does not have javascript enabled will not be able to tell that you even have a secure seal. The sidebox is completely blank unless Godaddy is allowed to run javascript.