Wells: Can I have different text size for image captions in galleries and blog pages?

I’m using the Wells template.

How can I have titles and a caption for gallery images appear in the lefthand sidebar? I would also like it to use a small font so this is not distracting and fits to the sidebar. But I don’t seem to be able to independently set text for the blog page. Is there any way to do this with CSS?

This is what worked for me, just from piecing information from other question's answers.

To "lock" in the sidebar. Mess around with those details.

 .collection-type-gallery.hide-meta .meta {
     right: 0;
     left: 70px;
     width: 150px;
     background: auto;
     bottom: 80px;
     max-width: 190px;
     z-index: 9999;
   }

This made the font smaller

.collection-type-gallery 
{
 font-size: 13px !important;
}