Design Challenge - 404/File Not Found page

For this design challenge I wanted to make the text as clear as possible. I've seen a lot of 404 page designs that reference the "404" term or some other type of error that may not make sense to the user if they aren't familiar with this type of error. This way, they know what happened, they know that we're looking into it (and that this is an unusual occurrence), and they can either go back or search for what they were trying to access.