how to set font size of toolbar in ionic

I am using toolbar I am able to make toolbar .But I need to customise that toolbar .Actually I am trying to set different font size as default in button and I need to give different width of buttons as default .

I have this button bar

  <div class="button-bar">
      <a class="button button-small" ng-click="handlerButtonClick('a')" ng-class="{'button_active':activeContentArea==='a'}">abc</a>
      <a class="button button-small" ng-click="handlerButtonClick('r')" ng-class="{'button_active':activeContentArea==='r'}">rnf </a>
      <a class="button button-small" ng-click="handlerButtonClick('d')" ng-class="{'button_active':activeContentArea==='d'}">dfff</a>
      <a class="button button-small" ng-click="handlerButtonClick('n')" ng-class="{'button_active':activeContentArea==='n'}">ndsdf</a>
    </div>

I need to override the default behaviour mean override fontsize of text and width of buttons here is my plunker http://plnkr.co/edit/eGaPwUdPgknwDnozMJWU?p=preview

Here's how to modify font-size and width of bar buttons

.button-bar > .button {
    flex: none; /* in order to modify width */
    width: 50px;
    font-size: 24px;
}

http://plnkr.co/edit/4d9X2icZJicGdjezR6WG?p=preview