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body { background-color: #e0e0eb; } div.header { margin-left: auto; margin-right: auto; max-width: 60em; padding-left: 2em; padding-right: 2em; } div.contents { margin-left: auto; margin-right: auto; max-width: 60em; background-color: white; padding: 2em; border-radius: 1em; }