CSS for rounded video blocks?

Hi all

I'm attempting to round the corners of some video blocks on a particular page but I'm having no luck.

Originally I was editing in a blank space & adding video blocks but I tried adding a new video section instead to see if the codes would work differently.

I've tried many CSS codes found on here & all over the internet and nothing seems to be working. 

If anyone has advice, that would be great!

Thank you!

16 minutes ago, magic_pie said:

particular page

Can you share the particular page?

https://megalodon-synthesizer-s6a6.squarespace.com/config/pages

Cheers

Not sure if that link is correct so let me know. Thank you

Can you add a site wide password and share that?

You can also try this to Website Tools > Custom CSS

.video-player .plyr .plyr__controls:before
{display:none!important;}

.plyr__video-wrapper video, .plyr__video-wrapper, .sqs-video-overlay
{border-radius:30px !important;}