Expressing sympathy with money: How much is appropriate at a funeral?. The monetary donation should be higher than 20 euros.
For more distant acquaintances, it is appropriate if there is around 20 euros in the envelope. For very close friends it should be up to 50 euros. If you don't want to put loose money in an envelope, you can also buy a voucher. For example, vouchers from a florist or a nursery are an option. It is also nice and tasteful to donate money to an organization that the deceased supported.