SimpleMap is a very simple addon that makes the worldmap smaller and removes the black background. The addon also fades the worldmap when you start moving.
Use “/smfade on” or “/smfade off” to turn on or off the fading.
I want to thank Ketho that made https://www.wowinterface.com/downloads/info24983-MapFader.html.
Thanks to his addon I was able to make this since it allowed me to know where to look to do my changes.