Why section are changing together?

So I was messing around with the default business starter template and was wonder why when I make changed to a section in the “About Page” changed the background to red and it followed to the “Contact Page” and to the rest. So I was wondering why it does that. Thanks

https://thomas-test-db96d2.webflow.io/about

https://thomas-test-db96d2.webflow.io/contact

https://preview.webflow.com/preview/thomas-test-db96d2?utm_medium=preview_link&utm_source=designer&utm_content=thomas-test-db96d2&preview=ed6df8fdd6e4cf94b2a50b29521a7158&pageId=5da977aaa2089f4d2a5a6326&mode=preview

Thats because they likely use the same styles. This is how CSS works. You generally use common styles throughout the site and when you change a style, any place where that style is used, it changes elsewhere. I suggest you watch a whole bunch of videos over at https://university.webflow.com to familiarize yourself with web standards and also webflow. When I started I spent a good 60 hours learning.