<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <style> body { background-color: white; color: black; animation: change-background-color 3s infinite alternate; } @keyframes change-background-color { to { background-color: black; color: white; } } </style> </head> <body> <h1>Animated body element</h1> </body> </html>
