.col.aantal-buis{
    padding-right: 0px;
}

.form-check-input.mt-0{
    width: 5px;
    padding: 5px;
    margin-left: -7px;
    margin-right: -8px;
}

.form-control.input-aantal {
    padding: 5px
}

.plussign::before {
    content: "\2795";
  }