Background Color Animation code: 1.index.html: <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Background Color Animation</title> <link rel="stylesheet" href="style.css"> </head> <body> <ul> <li></li> <li></li> <li></li> <li></li> <li></li> <li></li> <li></li> <li></li> <li></li> <li></li> </ul> </body> </html> 2.style.css: body { margin: 0; padding: 0; } ul { position: absolute; top: 0; left: 0; margin: […]