[Solved] How to change the color of a button on Bootstrap and Angular

elodie Asks: How to change the color of a button on Bootstrap and Angular
Currently the button is en red, when the user enters 2 figures for example, the button must be in blue. How i can create this switch on Bootstrap and Angular?

Code:
 <div class="col-12 col-md-4 text-center" [ngClass]="{'success': otp?.length == 2 ? true : false}">
  <button class="customButton" (click)="signin()">
      ok
   </button>
 </div>

Thank you in advance

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