Mangento Product tabs

Hello Jurjen,
you may try to make the DIV which includes the tabs of Product Details control be the page width via CSS code, however the solution may be a bit different depending on certain page layout and design.
Here is a short solution which for default theme:

.data-control-id-2809.bd-tabinformationcontrol-2.tabbable{
margin-left: -380px;
width: 1200px;
}

I need to say that this is a sample for static page width. You may also check the other samples which describe how to make the child DIV wider than parent DIV
http://forums.phpfreaks.com/topic/185624-make-a-div-bigger-than-its-container/
http://jsfiddle.net/9LsdV/
http://stackoverflow.com/questions/5581034/is-there-are-way-to-make-a-child-divs-width-wider-than-the-parent-div-using-css

Please remember that if you edit the theme files manually our changes are overwritten when you open and save (or Save & Download) theme in Themler.

Regards,
Aileen

Thank you

You're welcome.
Please let us know if you have any other questions.