Totally agree about the backgrounds. There are even slight changes in the gradient between slides of the same color, which made it look like the whole slideshow

Totally agree about the backgrounds. There are even slight changes in the gradient between slides of the same color, which made it look like the whole slideshow was doing some weird wiggly thing every time I went to a new slide. Looking at some of the featured decks, it's totally possible to make a slideshow on slid.es without having wiggly, animated, gradient backgrounds that change colors every 5 slides, so this was kind of a weird choice.