I have used select tag for a drop down as mentioned below.
<select id="identifier" [(ngModel)]="stagePropertyModel.stageIdentifier"
(ngModelChange)="signalChanged($event)"
class="propClass">
<option *ngFor="let val of identifers" [ngValue]="val">
{{val}}
</option>
</select>
how do we change the drop down list box's corner to curved with border-radius 4px.