title: Style backgroundColor p-fileUpload primeNG
body: <p>I work with a application angular 4 and p-fileUpload component.</p>
  
  <p>I want to change the background-color of component and the color of label text.</p>
  
  <p>I try to change the style in a css file but it doesn't work</p>
  
  <pre><code>.ui-button.ui-fileupload-choose.ui-widget.ui-state-default.ui-corner-all.ui-button-text-icon-left{
   background-color: #3F51B5 !important;
      border: 3px solid #3F51B5 !important;
      color: #d30e0e !important;
  }
  </code></pre>
  
  <p>However the generated code in html is:</p>
  
  <pre><code>&lt;span class="ui-button ui-fileupload-choose ui-widget ui-state-default ui-corner-all ui-button-text-icon-left" ng-reflect-klass="ui-button ui-fileupload-choose" ng-reflect-ng-class="[object Object]"&gt;
              &lt;span class="ui-button-icon-left fa fa-plus" ng-reflect-klass="ui-button-icon-left fa" ng-reflect-ng-class="[object Object]"&gt;&lt;/span&gt;
  </code></pre>
  
  <p>What the problem ?
  Is it possible ?</p>
  
  <p>Thanks a lot</p>