portainer/app/kubernetes/components/kubectl-shell/kubectl-shell.html

<button
  type="button"
  class="btn btn-xs btn-primary"
  ng-click="$ctrl.connectConsole()"
  ng-disabled="$ctrl.state.shell.connected"
  data-cy="k8sSidebar-shellButton"
  analytics-on
  analytics-category="kubernetes"
  analytics-event="kubernetes-kubectl-shell"
>
  <i class="fa fa-terminal space-right"></i> kubectl shell
</button>

<div ng-if="$ctrl.state.shell.connected" class="{{ $ctrl.state.css }}-kubectl-shell">
  <div class="shell-container">
    <div class="shell-item"><i class="fas fa-terminal" style="margin-right: 5px"></i>kubectl shell</div>
    <div class="shell-item-right">
      <i class="fas fa-redo-alt" ng-click="$ctrl.screenClear();" data-cy="k8sShell-refreshButton"></i>
      <i
        class="fas {{ $ctrl.state.icon }}"
        ng-click="$ctrl.miniRestore();"
        data-cy="{{ $ctrl.state.icon === '.fa-window-minimize' ? 'k8sShell-restore' : 'k8sShell-minimise' }}"
      ></i>
      <i class="fas fa-times" ng-click="$ctrl.disconnect()" data-cy="k8sShell-closeButton"></i>
    </div>
  </div>
  <div>
    <div class="nopadding">
      <div>
        <div id="terminal-container" class="terminal-container">
          <div style="position: fixed; color: #fff">Loading Terminal...</div>
        </div>
      </div>
    </div>
  </div>
</div>