facebook.css

.home_right_column > div:nth-child(1),
.home_right_column > div:nth-child(4),
#userNav,
#universalNav,
#pinnedNav,
#appsNav,
#createNav,
#pagelet_rhc_footer {
  -webkit-transition: opacity 250ms ease-in-out;
  -moz-transition: opacity 250ms ease-in-out;
  -ms-transition: opacity 250ms ease-in-out;
  -o-transition: opacity 250ms ease-in-out;
  transition: opacity 250ms ease-in-out;
  opacity: 0.05;
}

.home_right_column:hover > div:nth-child(1),
.home_right_column:hover > div:nth-child(4),
#userNav:hover,
#universalNav:hover,
#pinnedNav:hover,
#appsNav:hover,
#createNav:hover,
#pagelet_rhc_footer:hover {
  opacity: 1;
}