<label for="meeting-time">Choose a time for your appointment:</label>

<input
  type="datetime-local"
  id="meeting-time"
  name="meeting-time"
  value="2018-06-12T19:30"
  min="2018-06-07T00:00"
  max="2018-06-14T00:00" />

label {
  display: block;
  font:
    1rem 'Fira Sans',
    sans-serif;
}

input,
label {
  margin: 0.4rem 0;
}