Why isn't the site's home page fitting across the entire screen on my mobile device?

Hi,
When I view the landing/home page of the site on my mobile device (Samsung Galaxy S6), it doesn't not fit across the entire screen. About a 1/4 of an inch on the right hand side is white. This does not appear to be happening on any other page but the home page. What is causing this and how can it be resolved?

I look forward to hearing from you.

Sincerely,
Kimberly