title: Multiple class using ngClass - Angular 6
body: <p>When I have only one condition i.e <code>'e-card horCard card-OK': var1 == 0</code> ng multiple class works. 
  When I have other conditions below, using the same classes <code>'e-card horCard card-NOK': var1 &gt; 0</code> as in the first part of the condition, they simply do not apply them. What is a problem here?</p>
  
  <pre><code>  &lt;div [ngClass]="{'e-card horCard card-OK': var1 == 0, 'e-card horCard card-NOK': var1 &gt; 0}"&gt;
        &lt;div class="card-header"&gt;{{'SitesWithProblem' | translate | uppercase}}&lt;/div&gt;
        &lt;div class="card-data"&gt;{{globalStatistic.TotalSitesWithProblem}}&lt;/div&gt;
      &lt;/div&gt;
  </code></pre>