I am curious if the clients with older web browsers will have any issue in viewing and using sites with the default html5 template.

I use authorize.net and they offer a seal for adding to the website. I would like to use this seal (They provided the HTML code), but am unsure how to add it to my site. I tried entering the code  (Pasted it) into an html block, but I only get the actual code itself showing on the page. Do I need to place this into a file instead? I would like to place the seal both on my checkout page and on the home page.
This is the code they give me for my site:

<!-- (c) 2005, 2013. Authorize.Net is a registered trademark of CyberSource Corporation --> <div class="AuthorizeNetSeal"> <script type="text/javascript" language="javascript">var ANS_customer_id="a7ebffc2-2c4e-4ec9-a88a-7972acfcbd5a";</script> <script type="text/javascript" language="javascript" src="//verify.authorize.net/anetseal/seal.js" ></script> <a href="http://www.authorize.net/" id="AuthorizeNetText" target="_blank">Merchant Services</a> </div>
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Almost ready to go. You guys have been wonderful about helping me find everything I need, but I do have another question. I would like to change the color of the Blocks "title" bars (currently default is orange in default template). can you tell me where to find this so that I can change it to a color that matches my scheme. Thank you so much.

I am very happy with most of the layout on the default template, however I would like to change the size and color of the text in the categories block on my homepage. The list text is very small and gray. I want people to be able to see my list of categories that they can click on. I have been looking through my files, but am lost as to where I can change this.

I am brand new to AbanteCart cart. everything seems towork except when I try to add a new product it comes up with Fatal error saying there issomething wrong with my utils.php file online 302.
Here is what my utils.php file shows around that line. Line 302 is the one that reads:
$iso_date = DateTime::createFromFormat($date_format, $string_date, $timezone);

Here is the whole section:
function dateFromFormat($string_date, $date_format, $timezone = null) {
   $date = new DateTime();
   $timezone = is_null($timezone) ? $date->getTimezone() : $timezone;
   if (empty($date_format)) return null;
   $string_date = empty($string_date) ? date($date_format) : $string_date;
   $iso_date = DateTime::createFromFormat($date_format, $string_date, $timezone);
   $result = $iso_date ? $iso_date->getTimestamp() : null;
   return $result;