graphics, music, and background | WebTechKitchen; Your Web Technology Kitchen, contact us to create, or maintain your websites and other digital properties.

Great assets:

graphics:
https://opengameart.org/users/buch

music:
http://freemusicarchive.org/music/RoccoW/

texture generator, used for background:
http://cpetry.github.io/TextureGenerator-Online/