How to Fix the Columns Position in Lightning Datatable?

Sample Style :

.THIS .tableDiv {

max-width: 100em !important;

max-height: 20em !important;

overflow: scroll;

position: relative;

}

.THIS table {

position: relative;

border-collapse: collapse;

}

.THIS td {

padding: 0.25em;

}

.THIS th {

padding: 0.25em;

}

.THIS thead th {

position: -webkit-sticky !important;

position: sticky !important;

top: 0;

z-index: 1;

}

.THIS table thead th:first-child {

position: sticky !important;

left: 0;

z-index: 2;

}

.THIS table tbody th {

position: sticky !important;

left: 0;

background: white;

z-index: 1;

}