How to build a color visualizer like this one?

I'm trying to make a color visualizer for my company but I really don't know where to start.

I really like this example from Benjamin Moore: https://www.benjaminmoore.com/en-us/color-overview/find-your-color/color-a-room/1667/living-room-7?source=%2Fen-us%2Fcolor-overview%2Ffind-your-color%2Fcolor-a-room&color=OC-106&combination=2146-70,OC-46&room=1667

The main goal is to be able to choose color for more than 1 wall.

I do know HTML, CSS and a little bit of JavaScript.

Can someone point me in the right direction?