Edit font of Image Gallery Captions

[DrMarsha]

Can anyone direct me where in the HTML/CSS editor that I can change the image gallery captions font? I can do it in inspector, but it does not carry over to the Weebly editor? I have figured out how to add a custom font to every part of my website except the image captions in the gallery. Any help would be appreciated. Thanks! 

[DrMarsha]

I right-click > Inspect the caption font that I want to change and I can get it here (see attachment). However, I cannot find this information at all in the HTML/CSS editor in Weebly. Is it there and if so, where is it? Any other suggestions? I need to change the caption font to a custom font that I am already using in the other parts of the website. Thanks!