responsivecoding-bootcamp-testimonials-slider by using Object and flex

I am excited to finish this project by using object, Well, Object is a different concept compared to other programming language. It's very convenient and powerful, I am just dabbing it now. Forgive me, if the responsive part is kind of broken. I am still headache about responsive, which is so different from coding that if it's correct then it will work as you expect, there are so many miles between Ok to good for responsive and other CSS. Welcome any feedbacks. it's a great appreciation to gain any advice about improve CSS and responsive skills.