.fixed-table .header-fixed {
  position: absolute;
  top: 0px;
  z-index: 1020; /* 10 less than .navbar-fixed to prevent any overlap */
  border-bottom: 2px solid #d5d5d5;
  -webkit-border-radius: 0;
     -moz-border-radius: 0;
          border-radius: 0;
}
.fixed-table{
  display:block;
  position:relative;
}
.fixed-table th{
  padding: 8px;
  line-height: 18px;
  text-align: left;
}
.fixed-table .table-content{
  display:block;
  position: relative;
  height: 500px; /*FIX THE HEIGHT YOU NEED*/
  overflow-y: auto;
}
.fixed-table .header-copy{
  position:absolute;
  top:0;
  left:0;
}
.fixed-table .header-copy th{
  background-color:#fff;
}