gist-in-time.css

div.gist-meta {
  visibility: hidden !important;

  background-color: rgba(0,0,0,.8) !important;
  border-width: 0 !important;
  border-radius: 5px !important;
  -moz-border-radius: 5px !important;
  -webkit-border-radius: 5px !important;

  color: #fff !important;
  
  height: 1.5em !important;
  width: 40em !important;
  margin: -3em .5em 0 0 !important;
  float: right !important;
  
  position: relative !important;
  z-index: 1000 !important;
}

div.gist-data {
  border-bottom: 0 !important;
}

div.gist-meta a {
  color: #bbb !important;
}

div.gist-file:hover div.gist-meta {
  visibility: visible !important;
}