<i> as a tick

I'd like to use <i> 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.