OH3 Dashboard does not scroll down

i have an O2 Joggler with Xubuntu 14.04 that i use to display dashboard with Chromium Browser.
I’m asking here if someone had the same problem, more related to the browser I think than to OH3.

I have this problem: the main dashboard does not scroll down. I see the scroll bar at the left side of the browser but if I move it the page does not scroll down, instead I scroll everything included the 4 tab at the bottom of the main dashboard.
I’ve made a video: Openhab3 Dashboard scroll problem

Any hint??