table.dataTable thead th[data-is-resizable=true] {
  border-left: 1px solid transparent;
  border-right: 1px dashed #bfbfbf;
}
table.dataTable thead th.dt-colresizable-hover {
  cursor: col-resize;
  background-color: #eaeaea;
  border-left: 1px solid #bfbfbf;
 }
table.dataTable thead th.dt-colresizable-bound-min, 
table.dataTable thead th.dt-colresizable-bound-max {
  opacity: 0.2;
  cursor: not-allowed !important;
}