Borders on table cells

[Sean1943]

http://codepen.io/jgx/pen/wiIGc

I am designing a table with fixed headers based on the codepen above. It works fine until I add a border.
Adding
th, td {border:1px solid red;}
causes the head to widen more than the body and I cannot figure out why this happens.
Can anybody help me?
Sean

[Paulie_D]

Perhaps you can demo it because I’m not seeing any issues with adding borders to th or td

[Sean1943]

Perhaps I should have said that the difference in widths does not occur until you scroll down.

I just edited it again on Codepen and the head and body are clearly different in width when a border is added.

[Author]

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