Baylys, Unexpected greyish background

Hi, Elma team! I’m developing a new website using Baylys. All good, as always, except for the unexpected greyish background that you can see here: https://drive.google.com/open?id=0B__50PNRuE_ETllyWmJVSGV2NG8
This is on Chrome, on an Android device. I’ve tried on same Android with Firefox and it’s going pretty well.
Any tip for what’s going on? Thank you!
Best,
Joan