Centering Div Block To Scroll Both Ways Horizontally

Hi all!

I am stuck in the process on a MOBILE design. I have a div block that I want to be scrollable both directions horizontally, but I cannot figure out how to load the page with the div block centered (where content is overflowing on each side of the screen).

Once you take a look at my site you will understand what I mean if you don’t already.

I am happy inserting custom code to make this work. Please offer your wisdom!

Below I’ll also link a site that shows what I mean on a similar (and cooler) scale. TIA

Here is my public share link: LINK
Example website 2)