I have installed a blackout curtain in my bedroom. Unfortunately, there is still a lot of light entering from above and below the curtain, as you can see in the picture below. Is there anything I can do to make my room darker (while still keeping the curtain operational --- I need to be able to open and close it)?
Unfortunately "get a longer curtain" is not an option, because there is a radiator right below the window, and a longer curtain would block it out and reduce the effectiveness of heating. Ideally, I'd need to put some more cloth horizontally at the top and the bottom, somehow.
I still have some of the blackout cloth used for the curtain; I wonder if it is possible to make some sort of attachment with it (but I am also open to completely different ideas).
There are already shutters on the outside of the window, but they still let a lot of light through.