Highlighting Current Page in list of Image links

Hello I have a section of my website which consists of 11 pages, where I have added a series of image links a the bottom of each page to navigate to any of the other 11 pages. I would like for there to be a way to indicate what the current page is, either by having the current page image have a different colour or a box around it etc when you are on that page–something which I assume would involve creating a different image which would display in place of the default image. Is this possible, using images? Please find one of the pages at the following link
https://lavanyabalasubramanian.com/wp/index.php/landscape/1-4/

The 11 image links are at the bottom of each page. And the 11 pages are all under the “landscape” main menu section.

Sorry I hope I have explained that clearly. Please also keep in mind, I am very new to wordpress and a complete beginner at CSS/html.

Thanks!