Cesium tab sequence ion icon causes white region on right side of browser

Hi,

I have a strange behaviour in the tab sequence at the browser.

Sitting on the Cesium ion icon using the tab will shift the viewer window and on the right a white part is appearing.

Cesium_Tab1

Cesium_Tab

This happens in chrome as well in edge.

Has anyone a similar behaviour ? Where can I fix it.

In my application there are no other widgets switched on. I see that sometimes the tab in this stage will go to a search field and on other sandcastle demos it will go to the browser menu.

Can this influence the behaviour ?

RĂ¼diger