.reveal-if-active {
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  font-size: 16px;
  transform: scale(0.8);
  transition: 0.5s;
  
  label {
    display: block;
    margin: 0 0 3px 0;
  }
  input[type=text] {
    width: 100%;
  }
  
  input[type="radio"]:checked ~ &,
  input[type="checkbox"]:checked ~ & {
    opacity: 1;
    max-height: 100px;
    padding: 10px 20px;
    transform: scale(1);
    overflow: visible;
  }
  
}