.popup-form__tick {
    margin-top: 0;
}

.popup-form__tick > div, .b-callback__tick > div {
  font-size: 12px;
}

.popup-form__checkbox + span {
  width: 18px;
  height: 18px;
}

.b-callback__checkbox + span {
  width: 18px;
  height: 18px;
}


.popup-form__tick.error, .b-callback__tick.error {
  color: red;
}

.popup-form__tick.error .popup-form__checkbox + span,
.b-callback__tick.error .b-callback__checkbox + span
{
  border-color: red;
}

.b-callback__input.error {
  border: 1px solid red;
}