Data binding to change div background color not working

Ionic Framework ionic-v3
4

Argggh, realized the editor was hiding my markup…

<ion-content padding>
  
  <div class="signal-strength">
    <div class="bar-1" [style.background]="bar1Color"></div>
    <div class="bar-2"></div>
    <div class="bar-3"></div>
    <div class="bar-4"></div>
  </div>
<ion-content>
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