Mothers day help! for my stepmom?

okay, well obviously today is mothers day. I'm going to see my mom later, but right now i'm with my step mom. I'm 17 and we haven't always gotten along, but we do now. I want to make her a card for mothers day, but i don't know what to say or anything. I am completely lost. If you have any ideas please help! Your advice is greatly appreciated. Thanks!