Portal:Free and open-source software/Tab

Usage
The four parametres are: (The defaults are in each of Tab1, Tab2, and Tab3)
 * 1) Background colour of tab (#999)
 * 2) Colour of text on tab (default #ffffff)
 * 3) Colour of the 3px bottom border of the tab (default #003366)
 * 4) width of the top, left, and right borders of the tab (default 1)

To create a set of tabs, use these five elements. Keep the page tabs in the same order.

Plus a header for each tab. So, in this case where Portal:Free_software has three tabs, it has three headers:
 * Portal:Free_software/Header
 * Portal:Free_software/categories/Header
 * Portal:Free_software/Contribute/Header