* { margin: 0; padding: 0; }
body { font: 14px Georgia, serif; text-align: center; }

article, aside, figure, footer, header, hgroup,
menu, nav, section { display: block; }

section { padding: 100px; }

section:nth-child(odd) { background: #eee; }
section:nth-child(even) { background: #333; }