Does anyone know why the पॉटर्मोर background is purple?

The background is a dark and rich shade of purple..
that shade gives out a very magical, mysterious and mystical look. These are the perfect words to describe पॉटर्मोर because first of all its magical, and its still a slight mystery of what exactly we'll be able to do in पॉटर्मोर and what other features are there.. we know the basics but not exactly what it is..
I hope this जवाब your question! ^^

Purple is the color of mystery, spirituality and sacredness. Well, according to some traditions.

Perhaps, they did not wish to be partial to any house द्वारा choosing either green, blue, red या yellow, if आप see what I mean.

Purple is a magical color.

^It reminds आप of magic...maybe...