Metabase Cards Pixelating (Blurring) when projected to large screen

I've created a few Metabase dashboards which I've embedded on a website (via iFrame embedding). I'm projecting these dashboards on a large screen (80 in screen - 3840 x 2160).

However, the text in many of the cards are becoming blurry (and breaking).

Are there any settings/modifications I can do to make the text clearer?

Images of current output
[Note - The pixelation is not due to the images breaking but it is the text on the screen that's breaking]

Hi, I have a 4K monitor and Metabase works without any problem, how are you resizing the iframes when doing the embeddings? Also, please post diagnostic info