Is it permissible to use Quranic verses as a background in the design of an Islamic marriage website? And must a mufti be a scholar of fiqh who follows the opinions of the four imams, or is it permissible to take fatwas only from specialists in Hadith studies?

Using Quranic verses to highlight a legitimate matter is permissible, as long as it does not involve disrespecting the Quran. This applies to the verses displayed in the main banner; they are presented on screen for reading and people benefit from them. As for who is qualified to issue a fatwa, it is not a condition that one be a specialist to give a ruling on what one knows. However, it is better for the questioner to choose the most knowledgeable and most pious. It is permissible to act upon a fatwa unless it is contradicted by a stronger evidence. The mentioned shaykhs are among the best scholars of our time and are keen on disseminating knowledge and encouraging people to righteousness.