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html {
  -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=50)"; /* IE 8 */
  filter: alpha(opacity=50); /* IE 5-7 */
  -moz-opacity: 0.5; /* */
  -khtml-opacity: 0.5; /* old safari */
  opacity: 0.5; /* w3c */
}