Black out curtains

Kaila • Baby #1 Sophia 4/19/19🌸🎀

I have an almost 2 year old and I have “blackout curtains and blinds” but they do not work very well there’s still so much light that’s let in I’ve used pins and blankets to keep the light out more. They just always seem to move or something. So I was wondering if anyone has better recommendations for black out things? Thank you in advance