body { font-family: sans-serif; margin: 0; padding: 0; } header { background-color: #333; color: #fff; padding: 20px; text-align: center; } h1 { font-size: 2em; margin-bottom: 0; } p { line-height: 1.5; } article { padding: 20px; border: 1px solid #ddd; margin-bottom: 20px; } h2 { font-size: 1.5em; margin-bottom: 10px; } img { width: 50%; margin: 0 auto; display: block; } footer { background-color: #333; color: #fff; padding: 20px; text-align: center; }