Set ngx-bootstrap (Calendar) Current (Today) Date Class in Angular

Hi

I am trying to get current date (today) to be circled when i open date picker but it is not working.

css:

.custom-today-class{ background-color:blue; }

<div class="form-group col-3">
  <label>Possession/Avaialble From</label>
  <input type="text"
       placeholder="Datepicker"
       class="form-control"
       bsDatepicker [bsConfig]="{containerClass: 'theme-dark-blue', 
       dateInputFormat:'DD-MM-YYYY', customTodayClass: 'custom-today-class'}">
</div>