Column alignment

Hi there!

I have problem with column alignment in cover row. I put video as the backgound of the row and I checked equal height of columns. Inside is 1/1 column with centered content but everything is shifted to the left. If I put margin of the left to center everything it looks wrong on the mobile version.

Other problem I have with Placeholder Image. I put it because video doesnt apear on the mobile version, but in the pc version the background starts with this picture instead of video, how can I remove this effect?

Thank you in advance. This is link to the website: https://www.sicilyparagliding.it/