JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.8/angular.min.js"></script>
<div ng-app="myApp">
  <div ng-controller="myCtrl">
    <input type="tel" name="number" required="true" ng-model="retailNumber" />
    <button class="btn btn-card-right" ng-click="clearFun()">Clear</button>
  </div>
</div>

JavaScript

(function () {
  var myApp = angular.module('myApp', []);
  myApp.controller("myCtrl", function($scope) {
    $scope.clearFun = function() {
      $scope.retailNumber = "";
    }
  });
})();