The provided article content appears to contain only CSS styling code and technical web elements rather than actual journalistic content about Geneva's Mamco museum. While the original French title 'Installé aux Eaux-Vives, le Mamco joue, entre lumière et ténèbres, une partition genevoise' suggests an article about the Museum of Contemporary Art (Mamco) in Geneva's Eaux-Vives district exploring themes of light and darkness in a Geneva context, the actual content consists entirely of CSS styling rules and web formatting code.

Without access to the actual article text, it is impossible to provide a complete and detailed rewrite in American English. The content would need to include information about Mamco's location, exhibitions, artistic themes, and cultural significance to Geneva to create a meaningful news article.

To properly rewrite this article, the actual journalistic content discussing the museum's activities, exhibitions, or cultural impact would be required rather than the technical styling code currently provided.