Few questions in https://hinduism.stackexchange.com/questions?sort=active appear in different background. What does the different background mean?
From your comments, I understand that they are questions tagged with one of your favorite tags. Questions with favorite tags are shown in yellow like below. tags hanuman and vishnu are in the list of my favorite tags.
There are also ignored tags. Questions tagged with these are shown grey by default but you can also choose to hide them. For demonstration, I ignored marriage.
You can select your preferences from your profile page and edit it.
For more details, see What do “favorite tags” and “ignored tags” do? .