Hello! Looking for code to make my website less over stimulating ^_^

As the title says I'd like to know if there's anyway I can make some sort of "on/off" button for gifs/marquees and if I could swap out the colors to a darker color? If it helps, here's my website !

click here

(I also have a tint code on my "opinions/thoughts page" so maybe that could work for the color part?? idk..)

I'm quite bad at coding so ignore my messy code aha