this site is on joomla but you dont need to know joomla to fix this
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the template is just html, I will show you where it is and the css and provide you ftp access.
The guy who created this did not do it right in the css or something so that the right and left columns grow in height if the center content grows to tall
The same problem happens on this home page box where the content is, if the content is longer the white box that encloses it does not grow to accommodate it.
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I need someone to do this right away, I will be online and will send you the details to carry out the change right now.