jQuery Tablesorter Bootstrap styles

tablesorter-bootstrap.css

/* see http://joshmcarthur.com/2012/05/14/bootstrap-tablesorter-styles.html */
table .header {
    cursor: pointer;
}
table .header:after {
  content: "";
  float: right;
  margin-top: 7px;
  border-width: 0 4px 4px;
  border-style: solid;
  border-color: #000000 transparent;
  visibility: hidden;
}
table .headerSortUp, table .headerSortDown {
  background-color: #f7f7f9;
  text-shadow: 0 1px 1px rgba(255, 255, 255, 0.75);
}
table .header:hover:after {
  visibility: visible;
}
table .headerSortDown:after, table .headerSortDown:hover:after {
  visibility: visible;
  filter: alpha(opacity=60);
  -moz-opacity: 0.6;
  opacity: 0.6;
}
table .headerSortUp:after {
  border-bottom: none;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 4px solid #000000;
  visibility: visible;
  -webkit-box-shadow: none;
  -moz-box-shadow: none;
  box-shadow: none;
  filter: alpha(opacity=60);
  -moz-opacity: 0.6;
  opacity: 0.6;
}