You design your store on a big 27 inch monitor.

You design your store on a big 27 inch monitor. Your customer opens it on a phone, in a bus, with one thumb.

So before you fall in love with your hero section, open the store on your OWN phone. Scroll to a product. Try to find the price, the size and the add to cart button. With one hand.

If you need to zoom, or you scroll more than twice to find the button - that's where the sales are leaking. Not in the colors.