Styling a specific page

Hello everyone,

I was wondering how can I style a specific page of a theme. The theme is programmed to display a caption of each page I have on my website. Let’s say I want the caption of a specific page to be in a yellow color while the default color is white. If I go to style.css I can see the the caption color is set to white, and changing it will change the color of the captions in all pages. How can I style just a specific page?

Thanks in advance,
Omer