.table-responsive{
  height:400px;  
  overflow:scroll;
}
 thead tr:nth-child(1) th{
    background: white;
    position: sticky;
    top: 0;
    z-index: 10;
  }

.table > thead > tr > th,
.table > thead > tr > td {
font-size: .9em;
font-weight: 400;
border-bottom: 0;
letter-spacing: 1px;
vertical-align: top;
padding: 8px;
background: #87CEEB;
text-transform: initial;
color: #ffffff;
}