按钮周围的黄色边框

Question

自从我将Ionic3项目更新为Ionic4类型angular时，单击所有按钮周围都有黄色边框。

图片周围的黄色边框

.html

<button class="barFilterButton" 
   (click)="filterNoticedEvents('BAR')"
   [ngStyle]="{ border: activeFilters.bar ? '1px solid #eec344' : 'none' }"> 
</button>

.css

.barFilterButton {
      height: 50px;
      width: 50px;
      border-radius: 50%;
      background: white;
      background-image: url("../../assets/icon/icon_bar.png");
      background-size: 40px 40px;
      background-repeat: no-repeat;
      background-position: center;
      box-shadow: 0 4px 6px 0 rgba(0, 0, 0, 0.14), 0 4px 5px rgba(0, 0, 0, 0.1);
    }