I had blinds on the inside of the frame, took a large piece of cardboard and spray painted it black on both sides and put it in between the blinds and curtain, the had blackout curtains from Amazon (like $15 a set) and put them up. Used clips and tiny pins to make sure no light came through the cracks in the curtains. The cardboard is a trick I learned in the past, it helps prevent heat from being absorbed by the blackout curtains from the sun and since its black and behind blinds no obe can see it from outside. Hope this helps!