How to resize and align slider?

I am not the best with CSS code, and I just wondered, what is a simple way to increase the size of the metaslider? I want it to be in the footer of my theme, but even though I have tried increasing the width by px on the metalider plugin, it doesn’t increase as much as I want it too.

I have also ticked the box for ‘100% wide output.’

Also, I want the slider in the middle of the footer instead of on the left hand side, but when i ticked the box next to ‘center align’ it didn’t say to make much difference.

https://wordpress.org/plugins/ml-slider/