Hi Anne,
It looks like you’re using Sections throughout the site, but you’re only using a white background?
Sections are useful if you want different sections on your page, with different background colors or images, but if you’re just going for straight white, you can stick to the default editor, and just set the body background color to white in “Appearance > Customize > Colors > Base Colors”.
Either way, setting your body background color to white will make your news and contact page have that fluid look as well 🙂