<!-- Begin page -->
<div class="wrapper">
  <app-sidebar></app-sidebar>

  <!-- ============================================================== -->
  <!-- Start Page Content here -->
  <!-- ============================================================== -->

  <div id="content">
    <app-topbar></app-topbar>
    <!-- Start Content-->
    <div class="container-fluid" appMenuSelection>
      <nav aria-label="breadcrumb">
        <ol class="breadcrumb">
          <li class="breadcrumb-item"><a routerLink="/home">Home</a></li>
          <li class="breadcrumb-item active" aria-current="page">Admin</li>
        </ol>
      </nav>
      <div class="card">
        <mat-card-title class="card-header">
          <div class="row">
            Actions
            <button mat-raised-button color="primary" type="button" class="btn btn-outline-primary ml-auto mr-2" (click)="downloadCsv()"> EXPORT </button>
          </div>
        </mat-card-title>
        <div class="card-body">

          <mat-form-field appearance="outline">
            <mat-label> Filter </mat-label>
            <input matInput type="text" (keyup)="doFilter($event.target.value)" placeholder="Filter">
            <mat-icon matSuffix>search</mat-icon>
          </mat-form-field>

          <mat-table class="mat-elevation-z10" [dataSource]="dataSource" multiTemplateDataRows>

            <!-- Expand Column -->
            <ng-container matColumnDef="expand">
              <mat-header-cell *matHeaderCellDef> Expand </mat-header-cell>
              <mat-cell *matCellDef="let element" (click)="expandCollapse(element)">
                <span *ngIf="!element.isExpanded" class="signs"> + </span>
                <span *ngIf="element.isExpanded" class="signs"> - </span>
              </mat-cell>
            </ng-container>

            <ng-container matColumnDef="user">
              <mat-header-cell *matHeaderCellDef> NAME </mat-header-cell>
              <mat-cell *matCellDef="let action"> {{action.user}} </mat-cell>
            </ng-container>

            <ng-container matColumnDef="role">
              <mat-header-cell *matHeaderCellDef> ROLE </mat-header-cell>
              <mat-cell *matCellDef="let action"> {{action.role}} </mat-cell>
            </ng-container>

            <ng-container matColumnDef="action">
              <mat-header-cell *matHeaderCellDef> ACTION </mat-header-cell>
              <mat-cell *matCellDef="let action"> {{action.action}} </mat-cell>
            </ng-container>

            <ng-container matColumnDef="status">
              <mat-header-cell *matHeaderCellDef> STATUS </mat-header-cell>
              <mat-cell *matCellDef="let action">
                <span *ngIf="action.approval == true" class="badge badge-success badge-pill"> {{approvalStatus(action.approval)}} </span>
                <span *ngIf="action.approval == false" class="badge badge-danger badge-pill"> {{approvalStatus(action.approval)}} </span>
              </mat-cell>
            </ng-container>

            <ng-container matColumnDef="approve">
              <mat-header-cell *matHeaderCellDef> APPROVE </mat-header-cell>
              <mat-cell *matCellDef="let action">
                <button mat-raised-button color="primary" *ngIf="!action.approval" class="btn btn-outline-success" (click)="approveAction(action)"> Approve </button>
                <button mat-raised-button color="warn" *ngIf="action.approval" class="btn btn-outline-danger" (click)="disapproveAction(action)"> Disapprove </button>
              </mat-cell>
            </ng-container>

            <!-- Expanded Content Column - The detail row is made up of this one column -->
            <ng-container matColumnDef="expandedDetail">
              <mat-cell *matCellDef="let action">
                <div>
                  <span><strong>Staff Name:</strong> {{action.user}}</span><br>
                  <span><strong>Role:</strong> {{action.role}}</span><br>
                  <span><strong>Action Details:</strong> {{action.action}}</span><br>
                  <span><strong>Approval Status:</strong> {{action.approval}}</span><br>
                </div>
              </mat-cell>
            </ng-container>

            <mat-header-row *matHeaderRowDef="displayedColumns"></mat-header-row>
            <mat-row *matRowDef="let row; columns: displayedColumns;" matRipple class="element-row"
                     [class.expanded]="row.isExpanded"></mat-row>
            <mat-row *matRowDef="let row; columns: ['expandedDetail'];"
                     [@detailExpand]="row.isExpanded == true ? 'expanded': 'collapsed'" style="overflow: hidden"></mat-row>
          </mat-table>

          <mat-paginator [pageSize]="10" [pageSizeOptions]="[10, 20, 50, 100]" showFirstLastButtons></mat-paginator>
        </div>
      </div>
    </div>
    <app-footer appMenuSelection></app-footer>
  </div>
  <!-- ============================================================== -->
  <!-- End Page content -->
  <!-- ============================================================== -->
</div>

./admin.component.scss

button {
  width: 6rem;
}