.ibox-button {
  float:right; padding-bottom: 5px;
}

.dataTables_scroll
{
    position: relative;
    overflow: auto;
    max-height: 400px;/*the maximum height you want to achieve*/
    width: 100%;
}
.dataTables_scroll thead{
	position: -webkit-sticky;
	position: sticky;
	top: 0;
	background-color: #fff;
	z-index: 2;
}

.dataTables_scroll_header
{
    position: relative;
    overflow: auto;
    max-height: 200px;/*the maximum height you want to achieve*/
    width: 100%;
}

.dataTables_scroll_header thead{
	position: -webkit-sticky;
	position: sticky;
	top: 0;
	background-color: #fff;
	z-index: 2;
}