In Palo Alto, you can add a promo block to your Collection pages section.
To start, you need to open up the Theme Editor and open any Collection page.
The promo block allows you to change the background, heading, text, button text, button URL, and much more.
Only one (full) or two (half) blocks per row can be shown. To show two blocks next to each other you have to set them to be shown on the same line.
Next, make sure that all of your blocks are set to 'Half' width.