/* HIDDEN CLASSES */
  /*some elements are simply hidden*/
  div.hidden {
    display: none;
  }
  a.hidden {
    display: none;
  }
  /*all registration elements start off hidden*/
  div.hiddenStep {
    display: none;
    background-color: #FAA
  }
  div.hiddenClump {
    display: none;
    background-color: #AFA
  }
  /*some registration elements are hidden due to certain conditions*/
  div.hiddenCondition {
    display: none;
    background-color: #AAF
  }
  div.hiddenStepCondition {
    display: none;
    background-color: #AAF
  }
  /*used when a question or step is hidden because of something that is always going to be true for this appointment*/
  div.hiddenPermanentCondition {
    display: none;
    background-color: #AAF
  }
  div.hiddenStepPermanentCondition {
    display: none;
    background-color: #AAF
  }