Page Content Outside of Margins

Hello, I am very new to this and am having some issues with our website that are really frustrating, any help would be greatly appreciated!

I have been trying to add content to our pages and somewhere along the way it caused the content on all of our pages to stretch outside the borders. It has also caused the layer slider to be much, much bigger than it is supposed to be. I have attached a link to our website for reference.
Any help would be greatly appreciated, we are a non-profit charity that works with kids who are in foster care and up for adoption. Our hope is to have a website that will provide information as well as reach out to children in need.

Hope Valley Ranch