Problem size embebed video in theme Avril

I need help whith size embebed video.
The page no show the correct size of video.

The code is:

<iframe allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen="" frameborder="0" height="600" src="https://www.youtube.com/embed/kDTxIsrzFdA" width="800"></iframe>

Thaks you.

The page I need help with: [log in to see the link]