TD01

Hey. I'm creating a website based on blog posts and I've been customizing all my blog posts with the built-in features Squarespace offers, but I have not found a feature that allows me to use the color scheme I want. I'm looking to create something similar to the photos I've attached below where the main part of the post (Title, image, subtitle, etc.) has a black background, while the whole body of the post has white background. Is there a way to create this with code? Thanks in advance. 

Desktop view:

Mobile View: 

I'm writing lots of blog posts and at the end of every post, there's a "button" above the footer that reads 'Blog Post Title X' that takes you to the next blog post. Is there a way to erase that button? Thanks,