YouTube Videos not possible ot resize

Hi,
the shop is meanwhile online and a quick question come sup now, when i add a youtube video, it will be streched to 100% width but the height is always so small: https://ev-emirates.ae/shop/dry-steam-cleaner-ev-atlantis/

I did it in both ways: add just the link into the text field and aff it with the tiny editor as iframe .. both the same effect … any ideas how to resize it without adding it as html template?