portainer/app/components/auth/auth.html

<div class="page-wrapper">
  <!-- login box -->
  <div class="container simple-box">
    <div class="col-md-6 col-md-offset-3 col-sm-6 col-sm-offset-3">
      <!-- login box logo -->
      <div class="row">
        <img ng-if="logo" ng-src="{{ logo }}" class="simple-box-logo">
        <img ng-if="!logo" src="images/logo_alt.png" class="simple-box-logo" alt="Portainer">
      </div>
      <!-- !login box logo -->
      <!-- init password panel -->
      <div class="panel panel-default" ng-if="initPassword">
        <div class="panel-body">
          <!-- init password form -->
          <form class="login-form form-horizontal" enctype="multipart/form-data" method="POST">
            <!-- comment -->
            <div class="input-group">
              <p style="margin: 5px;">
                Please specify a password for the <b>admin</b> user account.
              </p>
            </div>
            <!-- !comment input -->
            <!-- comment -->
            <div class="input-group">
              <p style="margin: 5px;">
                <i ng-class="{true: 'fa fa-check green-icon', false: 'fa fa-times red-icon'}[initPasswordData.password.length >= 8]" aria-hidden="true"></i>
                Your password must be at least 8 characters long
              </p>
            </div>
            <!-- !comment input -->
            <!-- password input -->
            <div class="input-group">
              <span class="input-group-addon"><i class="fa fa-lock" aria-hidden="true"></i></span>
              <input id="admin_password" type="password" class="form-control" name="password" ng-model="initPasswordData.password" autofocus>
            </div>
            <!-- !password input -->
            <!-- comment -->
            <div class="input-group">
              <p style="margin: 5px;">
                <i ng-class="{true: 'fa fa-check green-icon', false: 'fa fa-times red-icon'}[initPasswordData.password !== '' && initPasswordData.password === initPasswordData.password_confirmation]" aria-hidden="true"></i>
                Confirm your password
              </p>
            </div>
            <!-- !comment input -->
            <!-- password confirmation input -->
            <div class="input-group">
              <span class="input-group-addon"><i class="fa fa-lock" aria-hidden="true"></i></span>
              <input id="password_confirmation" type="password" class="form-control" name="password" ng-model="initPasswordData.password_confirmation">
            </div>
            <!-- !password confirmation input -->
            <!-- validate button -->
            <div class="form-group">
              <div class="col-sm-12 controls">
                <p class="pull-left text-danger" ng-if="initPasswordData.error" style="margin: 5px;">
                  <i class="fa fa-exclamation-circle" aria-hidden="true"></i> Unable to create default user
                </p>
                <button type="submit" class="btn btn-primary pull-right" ng-disabled="initPasswordData.password.length < 8 || initPasswordData.password !== initPasswordData.password_confirmation" ng-click="createAdminUser()"><i class="fa fa-key" aria-hidden="true"></i> Validate</button>
              </div>
            </div>
            <!-- !validate button -->
          </form>
          <!-- !init password form -->
        </div>
      </div>
      <!-- !init password panel -->
      <!-- login panel -->
      <div class="panel panel-default" ng-if="!initPassword">
        <div class="panel-body">
          <!-- login form -->
          <form class="login-form form-horizontal" enctype="multipart/form-data" method="POST">
            <!-- username input -->
            <div class="input-group">
              <span class="input-group-addon"><i class="fa fa-user" aria-hidden="true"></i></span>
              <input id="username" type="text" class="form-control" name="username" ng-model="authData.username" placeholder="Username">
            </div>
            <!-- !username input -->
            <!-- password input -->
            <div class="input-group">
              <span class="input-group-addon"><i class="fa fa-lock" aria-hidden="true"></i></span>
              <input id="password" type="password" class="form-control" name="password" ng-model="authData.password" autofocus>
            </div>
            <!-- !password input -->
            <!-- login button -->
            <div class="form-group">
              <div class="col-sm-12 controls">
                <p class="pull-left text-danger" ng-if="authData.error" style="margin: 5px;">
                  <i class="fa fa-exclamation-circle" aria-hidden="true"></i> {{ authData.error }}
                </p>
                <button type="submit" class="btn btn-primary pull-right" ng-click="authenticateUser()"><i class="fa fa-sign-in" aria-hidden="true"></i> Login</button>
              </div>
            </div>
            <!-- !login button -->
          </form>
          <!-- !login form -->
        </div>
      </div>
      <!-- !login panel -->
    </div>
  </div>
  <!-- !login box -->
</div>