2 color Background

Hi everyone, i am tauqeer and new to bubble platform. tough the platform is self explainatory still i have some issues while trying to learn and make stuff here. The problem i am facing or the solution that i am looking for is making a multicolor background. if you go to airbnb.com and scroll down you will see that the color of bg changes from black to white. like not as a whole but half page is white and half is black. i am making a responsive page so i want to know that how do i acheive that. i have tried floating groups behing website but they dont stay intact. please anyone

@discobot can you help me here

Hi! To find out what I can do, say @discobot display help.