adding color behind text/highlighting

hi everyone! I'm new to spacehey and fairly new to coding. I mostly have my page how I like but I was wondering if there was any way to add a highlight or background just for all the text? I have images for my textboxes but it makes the text hard to read, so I was thinking if I could add color behind all text (like a highlighter) it would be easier to see. I don't know if that makes sense because I'm not good at expressing/communicating what is in my brain. Anyways, if anyone knows how to do this or has any suggestions, it would be greatly appreciated <3

thanks y'all :)