Bassinet mattress...

B17
So 2 weeks ago i made a post asking if i should go ahead and get a new bassinet mattress since our bassinet is a 10 year old hand me down... Well we went ahead and ordered one from amazon and we got it and its literally about 1/4-1/2 an inch too big. I had to shove it in there a little bit.. Is this still safe for baby? I heard too small is definitely dangerous. .what about a quarter-half an inch too big??? It still fits its just a tad bit wrinkled up in the corner.... ? Ftm! Sorry if i sound stupid im jus concerned for my babys health:)