<i> as a tick

[fifonik]

I'd like to use element for tick.
However, with the following selector in css it is not possible:

.nya-bs-select.btn-group .dropdown-menu li a span.check-mark {
  display: none;
}

Could you please change it to:

.nya-bs-select.btn-group .dropdown-menu li a .check-mark {
  display: none;
}

Thanks.