How increase default caption size?

Hi there, I have a few old posts that use the classic editor and I would like to increase the default photo caption size and get rid of italics and make bold… I used stylebot and it came up with this css:

p.wp-caption-text {
font-size: 20px;
font-style: normal;
font-weight: bold;
}

however that did not work…. any suggestions?

Example of post with small italic captions:
https://www.thomashenthorne.com/moving-to-marin/

Thanks!
Rob