html { height: 100%; } body { display: flex; justify-content: center; height: 100%; margin: 0; padding: 0; box-sizing: border-box; color: #333; -webkit-font-smoothing: antialiased; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif; background: #eee; } * { margin: 0; padding: 0; box-sizing: border-box; } main { width: 85%; padding: 10px 0 0 0; } .page { color: #757575; background: #fff; padding: 3px 10px; } @media (max-width: 750px) { main { padding: 0; width: 100%; } }