Need an alert at top of page on unsuccessful form submission

When someone is filling out a registration form on mobile device, if they submit the form and for some reason they missed one of the required fields, the way it alerts them is with a red flag under the field. The problem is that since the form is on a mobile device, that field can sometimes be out of view if they don’t scroll down. The page refreshes after they click the submit button, but other than the red flag under the field, they have no other way of knowing that the form was not submitted successfully. Is there a way we can post an alert at the top if the page after they click the submit button and the page refreshes, so that they are made aware that the form submission was not successful and they need to scroll down to see what field has the red flag?

Thanks