I made a sea

[Noah_S]

Underwater

It's like the garden, but underwater. The code is a bit wonky, but there are fish. And they move. Feel free to play with it and/or improve on my attempt at giving it a seabottom.

[Dan Q]

The CSS you're looking for is:

Code

background-size: cover;

That means "make the background image so large that it completely covers the window, even if that means losing a bit of the background off the sides or bottom" (i.e. the same width as the window and at least as tall, OR the same height as the window and at least as wide).

Alternatively, you might want:

Code

background-size: contain;

That means "make the background as tall or as wide as the container, so the whole image can still be seen, even if that means the image has to repeat or have un-covered bars at the sides".

background-repeat: repeat-xy; isn't a thing, by the way. "repeat" means "repeat in both directions", "repeat-x" and "repeat-y" limit repeating to one direction or another, and "no-repeat" prevents repetition.

Hope that helps!