Re: table header not styling

!important is to over-ride any specificity you might have on the page.  For example, you might have something like this:

#example {
font-size: 14px !important;
}

#container #example {
font-size: 10px;
}

In the absence of !important, the font size will be 10px for a div called ID example but by using !important, the second declaration CAN'T over-ride the first.  In normal cases that is what happens but in this case it can't because of the word !important.  I hope you get the idea.