Youtube videos open into a hilariously small embed

[jeromechoo]

Describe the bug Opening a Youtube video from a post leads to a view with a working video embed but it is extremely small as to be unviewable unless full screened.

To Reproduce Steps to reproduce the behavior:

1. Go to https://phanpy.social/#/masto.ai/s/111779108628881994
2. Click on the video

Expected behavior Video should scale to something appropriate to the viewport size.

Screenshots Current size:

Proposed size:

Desktop (please complete the following information):

• OS: 15" Macbook Air M2, 2023
• Browser: Firefox
• Version: 121.0.1 (64-bit)

Additional context Reproducible across latest Chrome and Safari.