Error Field Validation on Appointments +

If a user submits an appointment request without completing all required fields, they are presented with an error message in an overlay that says "Please fill in the required field". However, there is no visual indication as to which field(s) they haven't completed. To make it easier for the user to figure out what they didn't complete, I would like to request that the field(s) that are not completed be highlighted in some way. Either highlighted the field in red, putting a border on the field, placing red instructional text above the field or putting an "X" next to the field.

I would like to request this be added in a future update.