There are some very astute 404 error pages out there: https://simplefreethemes.com/404-error-page-templates/

I recreated this image from a BlueMail error: 404.xar

Click image for larger version.  Name: 404.png  Views: 96  Size: 70.2 KB  ID: 131365
Can you do better?

As ever, I prefer SVG/Text over straight images for crispness & download speed but I'm not doing the marking, your visitors are.

Acorn