Go to https://events.weka-fachmedien.de/medical-design-solution-day/partner(I'm using chrome) Scroll down to the "HY-LINE" logo and hover it. Look at the sticky header. It jumps for some milliseconds (I think the transition time). If it doesn't: scroll some pixels up / down. It doesn't happen always - but in like 1 out of 5 times / scroll positions.