caption running off screen on mobile

Love this plugin! However when I tap a photo on a mobile device (after the plugin gracefully resizes the thumbnails) the photo that launches is the right size but its caption (in the black ‘bubble’ under the photo) is too large and runs off the left and right sides of the screen. any ideas on how to fix this? it looks like the CSS call for the cation is .fancybox-title-float-wrap .child which is the same for the ‘desktop’ version and the mobile version of the gallery. Thanks!

https://www.ads-software.com/plugins/responsive-gallery-grid/