Ah i did not know that, but it is not working correctly. The element
.leftwrapper has a standard
display:none just to hide weird placement. After the page has been loaded and when its is resized it is being prepared with the right CSS. This explains:
`$( document ).ready(calcLeftWrapper());
But when you navigate, click on “Domein & Hosting” or “Contact” the same div should be recalculated and made visible, which does not happen.