Click green flag. It's just supposed to be a wallpaper/art, so use fullscreen to view press space to look through the different backdrops There's a google app called Chrome theme creator by theme beta, that let's you create your own google theme.
UNDERTALE belongs to Toby Fox I did all the art except for the It's Showtime! font, which I got from google. I made this to be a wallpaper, so please enjoy. If it doesn't fit your computer, please tell me in the comments! I want everyone to be able to enjoy, so I may change some things for different computers