You can easily build sticky headers with our content box variation "Pinned Box". You can find out how in our tutorial video in the chapter "Sticky Header".
A small note on the side: The name could lead one to assume that sticky headers are built with the Sticky Box variation instead of the Pinned Box. However, the CSS function required for a Sticky Header is "CSS fixed" and this is exactly what our Pinned Box does. Theoretically, you could also use the sticky box if you did not place it in the template part header but around the outside of the header. But then you would have to do this individually on each page on which you have included this header.