建立一个旋转木马滑动项目4

I'm currently building a slider/carousel that could slide items by 4 instead of 1. I managed to make it slide 1 by 1 and append the first element to the last and vice versa by clicking the next and prev buttons. How can I make my carousel slide by 4. I would prefer not to use bootstrap.I'm currently building a slider/carousel that c