Gift for teachers

I'm curious to know if it's customary in HK to give school teachers (kindergarten) small gifts for major holidays?

We just moved here this summer from the US, where we used to give the teachers a thank-you card with a small gift (valued $10-20 USD) on big holidays. Not sure if the two upcoming holidays are 'big' enough in that sense... and whether teachers in HK would happily accept such (without worrying about ICAC, lol).

Apologize if this topic is off the themes of this board; I wasn't really sure where to post such a question... any comments welcome!