="text-uppercase text-muted secondary-text" for="username">Username</label>
                    <div class="input-group mt-2d mb-5">
                      <div class="input-group-prepend mr-2">
                        <span class="input-group-text"><span class="material-icons">account_circle</span></span>
                      </div>
                      <input class="form-control" type="text" id="login-username" name="username" autocomplete="off" pattern="([a-zA-Z0-9_]){2,15}" value="{{ default_user }}" r