<div class="container my-5">

  <div class="md-form md-outline input-with-pre-icon mt-sm-4">

     <i class="fas fa-lock input-prefix input-prefix-secondary"></i>

     <input type="password" id="password1" class="form-control">

     <label for="password1">Password</label>

     <small id="passwordHelp" class="form-text text-muted">8 - 50 characters including one upper case letter, one lowercase letter one digit and one special character.</small>

  </div>

</div>