Import file and and scrolloff class to your iframe

<div class="gmap-wrapper">
  <iframe class="scrolloff" src="https://www.google.com/maps/embed?pb=!1m18!1m12!1m3!1d44754.55736493158!2d9.151166379101554!3d45.486726!2m3!1f0!2f0!3f0!3m2!1i1024!2i768!4f13.1!3m3!1m2!1s0x4786bfca7e8fb1cb%3A0xee8d99c9d153be98!2sCorsidia!5e0!3m2!1sit!2sit!4v1496947992608" width="600" height="450" frameborder="0" style="border:0" allowfullscreen></iframe>
</div>

See it in action: Corsidia Demo School