For some reasons BeautifulSouf does not convert entities with convertEntities=["xml","html"], use convertEntities=BeautifulSoup.ALL_ENTITIES instead.
#gravity { width: 100%; margin: 5px 0; border-spacing: 5px; }
#gravity td { text-align: center; vertical-align: middle; padding: 5px 0; background-color: #d0d0d0; }
#gravity a { }
#gravity a:hover { color: #505050; background: none; }