Allah hu Nuru Samawati wal Ard
The background shows the transition from Heaven and Earth, where both meets there is a hint of entire galaxy just to make an statement that its not only this earth and heavens we are talking about. The verse is one of the most beautiful verse of Quran it says that Allah is the light of heaven and earth and every where and anything we know of. This light can be taken as many things knowledge or sight we only see what He want us to see. As with everything in Quran there are many layers and many meanings