[themes] menu bar unknown border

[Christian Quiñones]

Can someone direct me in the right direction as far as theming a very
generic website.  I am currently using Adaptive themes and when theming the
menu bar at the top right corner I get this border underneath.  According to
firebug, it's element.style { min-height: 40px}  that causes this issue,
however I cannot overrde it. the website is www.csdpacifico.com/drupal_pac.
Any hints will be greatly appreciated.
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