vpnControl/templates/account_box.html

      <form action="/account" method="post">
        <div class="form-group row">
          <label for="inputUsername3" class="col-sm-2 col-form-label">username</label>
          <div class="col-sm-10">
            <input type="text" class="form-control" id="inputUsername3" name="username" placeholder="{{ .Username }}">
          </div>
        </div>
        <div class="form-group row">
          <label for="inputPassword3" class="col-sm-2 col-form-label">passwort</label>
          <div class="col-sm-10">
            <input type="password" class="form-control" id="inputPassword3" name="password" placeholder="passwort">
          </div>
        </div>
        <div class="form-group row">
          <div class="offset-sm-2 col-sm-10">
            <button type="submit" class="btn btn-primary">speichern</button>
          </div>
        </div>
      </form>