Thanking big staff for gift

Natalie • Feb ’20 💚 March ‘18 💙 Dec ‘15 💙🧩 4 miscarriages 🌈
I was presented with $150 after a staff meeting as a gift for my baby today.  They also served cake - it was really nice!  I work in a big school building - we have a huge staff!!!  I know everyone chipped in a few bucks each, but wow, it added up and really means a lot!  
How did you thank your big staff? In the past, people have sent a thank you email...I'm not opposed to that so long as it sounds sincere!