mempool/frontend/src/app/components/search-form/search-form.component.html

<form [formGroup]="searchForm" (submit)="searchForm.valid && search()" novalidate>
  <div class="d-flex">
    <div class="search-box-container mr-2">
      <input #instance="ngbTypeahead" [ngbTypeahead]="typeaheadSearch" (selectItem)="itemSelected()" (focus)="focus$.next($any($event).target.value)" (click)="click$.next($any($event).target.value)" formControlName="searchText" type="text" class="form-control" placeholder="Transaction, block height, hash or address">
    </div>
    <div>
      <button type="submit" class="btn btn-block btn-primary">Search</button>
    </div>
  </div>
</form>