Click a background to set this page's background.
Click icons above to change BG category
Click and drag to desktop to save, or right click and select 'Save image as' then upload to your server/neocities

A tip for bordered backgrounds is to use the css code 'background-size:100%' in the body of your page. Or to use a tiled background as bordered, use 'background-repeat:repeat-y' and set the background color using 'background-color:black' but replace black with the color of your choice.