White Space after Image Captions

Hi,
Love the nice simple look of Penguin… but would like to have a little bit of white space added AFTER an Image Caption.

Have a look at this page in particular;
https://www.peteshobbyrailway.club/progress-reports/progress-report-no-37-platform-waiting-room-construction-works-commence-plus-updates/

The caption is easily confused as belonging to the image below due to the fact there are a few pixels of white space between the image and the caption but virtually NONE AFTER the Caption and the next image.

Ideally I’d like see the theme updated to include some white space included AFTER the caption… but would be fine with a Custom CSS code to fix the problem.

Is this feasible???

Thanks in advance.

The page I need help with: [log in to see the link]