You can control the border color associated with the tabs by editing the border property that is present in '.shadetabs li a ' CSS rule.
You should be able to change the border color of the div element the way you've mentioned without any issues. But mostly you have to change the border color of the tabs also. In other words this is a two step process
(1) Change the border color of tabs
(2) Change the border color of content container.
Code:
<div style="border: 1px solid #FE2E13; padding: 10px; width: 450px; margin-bottom: 1em;">
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