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body { color: #222; font-family: sans-serif; line-height: 1.5; margin: 1rem; max-width: 768px; } header { border-bottom: 1px solid #222; margin-bottom: 1rem; } footer { border-top: 1px solid #222; margin-top: 1rem; } a { color: #00e; text-decoration: none; }