Very nice gradient background with red color, I would increase the speed of the particles and make the particles multicolored . Why do you have variable var , or is it such a trick that with variable let will not work ? Your lesson without water , make complex points clear to understand . Thank you for another lesson
var swiper = new Swiper(".swiper", {}) is an existing function of Swiper JS. So, this function will not work with "let". If the "multicolor" means gradient, you cannot make particles gradient because Particles JS does not have such a feature. But if you say you want to use different colors for particles, you can watch my "Coverflow Effect Slider" video.
