Animated 404 page templates in HTML and CSS

These are full 404 pages, not just an illustration: heading, message, a button back to the home page and an animation that gives the error some personality. Half of them tell a space story (a total eclipse, Earthrise, mission control, a black hole, the James Webb telescope, zero gravity); the other half are written for real businesses (a clinic, a restaurant, a hotel, an online store, a café, a gym, a veterinary practice).

Every page ships as plain HTML and CSS, so it drops into any site whatever the stack. Change the texts and colours live, copy the files and point the button at your own home page.