title: Conditional border color
body: <p>I would like to set the border-color of an item depending on its category. I tried using [ngStyle] and style.color but it doesn't work. 
  Can someone help me ? </p>
  
  <pre><code>&lt;ion-grid *ngFor="let item of items" (click)="openDetail(item)" [style.color]=" api.getCategoryColor(item.categories[0])"&gt;
  </code></pre>
  
  <p>Thank you</p>
  
  <p>Edit : 
  it works when setting color "blue" for example : </p>
  
  <pre><code>&lt;ion-row [style.border]="'solid 1px ' + 'blue'" &gt;
  </code></pre>