Created Coding Bootcamp Slider with sass and animations

Hey there all, created this slider component with sass, quite a roller-coaster ride for me, thought it was easy, but for me the difficult part was the background images.......(quite a story)

Also one thing on how to provide dynamic top and bottom margin to the element of slide-container, like I want to give it a top and bottom margin so that it always look in center on different screen-width...... I know it can be done with media-queries, but want to know alternative way like giving a margin

margin: calc(100vh*some-optimal-percentage) auto;

Something like that, do provide feedback to improve, thank you for all your advice and appreciations