table.dataTable td.dt-control {
  text-align: center;
  cursor: pointer;
}
table.dataTable td.dt-control:before {
  height: 1em;
  width: 1em;
  margin-top: -9px;
  display: inline-block;
  color: white;
  border: 0.15em solid white;
  border-radius: 1em;
  box-shadow: 0 0 0.2em #444;
  box-sizing: content-box;
  text-align: center;
  text-indent: 0 !important;
  font-family: "Courier New", Courier, monospace;
  line-height: 1em;
  content: "+";
  background-color: #31b131;
}
table.dataTable tr.dt-hasChild td.dt-control:before {
  content: "-";
  background-color: #d33333;
}