Slider, Active slide in center and the previous & next slide seen partially

Hi everyone,

I am not able to make a slider which has the active slide in the center & there is a little preview of the previous & the next slide.

I found a similar post but the solution is not working for me.

Here is my read-only link to the project:

I have made a slider on the homepage of my project. Please check it out!
I have been banging my head on this for last 2 days. Will be a great great help!