This is a very old card from 1900 so the card has undivided back. It means there is no space for writing just for the address on the back, this is why the sender wrote on the front.
The text - Boldog karácsonyt! - is embossed with gold and there is also white glitters on the tree.
You can find my other vintage Christmas card if you click on the label 'old Christmas cards' on the sidebar.