スマホのアコーディオンメニューで、スクロールとタップを分けたい

Question

アコーディオンメニューでPC版では問題ないのですが、
スマホ版だと、
スクロールするためにアコーディオンメニュー(h2)の部分のスクリーンを触ると、アコーディオンが開いてしまいます。

https://foundfund.jp/
理想としては上記サイトの「よくある質問」（最下部らへん）のアコーディオンメニューのような、
スクロールするために質問タイトルを触ってもアコーディオンメニューが開かずに、
「開けよう！」と思ってタップすると開くような仕様にしたいのですが、@-webkit-keyframesらへんの数値をいじってもうまく行きませんでした。

伝わりにくいかも知れないですが、よろしくお願いします。
ちなみに以下のアコーディオンメニューを使ってます。
https://codepen.io/chriswrightdesign/pen/cmanI

<section class="question-content">
  <div class="question-content-wrap">
    <div class="question-content-wrap-list">
      <div class="question-content-wrap-list-container">
        <div class="accordion">
          <dl>
            <dt>
              <h2  aria-expanded="false" aria-controls="accordion2" class="accordion-title accordionTitle js-accordionTrigger">
                詳しいPDF資料はありますか？</h2>
            </dt>
            <dd class="accordion-content accordionItem is-collapsed" id="accordion2" aria-hidden="true">
              <p>はい。<br>ダウンロードはから出来ます。</p>
            </dd>
            <dt>
              <h2  aria-expanded="false" aria-controls="accordion2" class="accordion-title accordionTitle js-accordionTrigger">
                詳しいPDF資料はありますか？</h2>
            </dt>
            <dd class="accordion-content accordionItem is-collapsed" id="accordion2" aria-hidden="true">
              <p>はい。<br>ダウンロードはから出来ます。</p>
            </dd>
            <dt>
              <h2  aria-expanded="false" aria-controls="accordion2" class="accordion-title accordionTitle js-accordionTrigger">
                詳しいPDF資料はありますか？</h2>
            </dt>
            <dd class="accordion-content accordionItem is-collapsed" id="accordion2" aria-hidden="true">
              <p>はい。<br>ダウンロードはから出来ます。</p>
            </dd>
          </dl>
        </div>
      </div>
    </div>
  </div>
</section>

.question-content {
  height: auto;
  padding-bottom: 30px;
  background-color: white;
  border: 1vw solid  #02007F;
}

.question-content-wrap {
  max-width: 1080px;
  margin: 0 auto;
}

.question-content-wrap-ttl {
  text-align: center;
  padding: 40px 0px;
}

.question-content-wrap-ttl h1 {
  font-weight: bold;
  font-size: 34px;
  margin-bottom: 0px;
}

.question-content-wrap-ttl p {
  font-size: 22px;
  font-weight: bold;
  margin-bottom: 0px;
}

.accordion dd,
.accordion__panel {
  background-color: #eee;
  line-height: 1.5em;
}

.accordion h2 {
  font-size: 23px;
  font-weight: bold;
  margin-bottom: -7px;
  -webkit-transition: 0.8s ease-in-out;
  transition: 0.8s ease-in-out;
}

.accordion p {
  padding: 20px;
  margin-bottom: 0px;
  font-weight: bold;
}

dt, dd {
  margin-left: 0px;
}

.accordion {
  position: relative;
  background-color: #eee;
}

.question-content-wrap-list-container {
  max-width: 960px;
  margin: 0 auto;
}

.accordionTitle,
.accordion__Heading {
  background-color: #02007F;
  text-align: left;
  font-weight: 700;
  padding: 20px;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  /* 横並び */
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  /* 上下中央配置 */
  text-decoration: none;
  color: #fff;
  -webkit-transition: background-color 0.5s ease-in-out;
  transition: background-color 0.5s ease-in-out;
}

.accordionTitle:after,
.accordion__Heading:after {
  content: "+";
  font-size: 2.5em;
  line-height: 0.5em;
  margin-left: auto;
  -webkit-transition: -webkit-transform 0.3s ease-in-out;
  transition: -webkit-transform 0.3s ease-in-out;
  transition: transform 0.3s ease-in-out;
  transition: transform 0.3s ease-in-out, -webkit-transform 0.3s ease-in-out;
}

.accordionTitle:hover,
.accordion__Heading:hover {
  color: orange;
  -webkit-transition: 0.8s ease-in-out;
  transition: 0.8s ease-in-out;
}

.accordionTitle:before,
.accordion__Heading:before {
  content: "Q";
  font-size: 48px;
  padding-right: 20px;
  line-height: 0.5em;
  -webkit-transition: -webkit-transform 0.3s ease-in-out;
  transition: -webkit-transform 0.3s ease-in-out;
  transition: transform 0.3s ease-in-out;
  transition: transform 0.3s ease-in-out, -webkit-transform 0.3s ease-in-out;
}

.accordionText {
  text-align: left;
  font-weight: 700;
  padding: 20px;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  /* 横並び */
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  /* 上下中央配置 */
  text-decoration: none;
}

.accordionText:before {
  content: "A";
  font-size: 48px;
  padding-right: 20px;
  line-height: 0.5em;
}

.accordionTitleActive,
.accordionTitle.is-expanded {
  color: orange;
}

.accordionTitleActive:after,
.accordionTitle.is-expanded:after {
  -webkit-transform: rotate(-225deg);
          transform: rotate(-225deg);
}

.accordionItem {
  height: auto;
  overflow: hidden;
  max-height: 50em;
  -webkit-transition: max-height 1s;
  transition: max-height 1s;
}

@media screen and (min-width: 48em) {
  .accordionItem {
    max-height: 15em;
    -webkit-transition: max-height 0.5s;
    transition: max-height 0.5s;
  }
}

.accordionItem.is-collapsed {
  max-height: 0;
}

.no-js .accordionItem.is-collapsed {
  max-height: auto;
}

.animateIn {
  -webkit-animation: accordionIn 0.45s normal ease-in-out both 1;
          animation: accordionIn 0.45s normal ease-in-out both 1;
}

.animateOut {
  -webkit-animation: accordionOut 0.45s alternate ease-in-out both 1;
          animation: accordionOut 0.45s alternate ease-in-out both 1;
}

@-webkit-keyframes accordionIn {
  0% {
    opacity: 0;
    -webkit-transform: scale(0.9) rotateX(-60deg);
            transform: scale(0.9) rotateX(-60deg);
    -webkit-transform-origin: 50% 0;
            transform-origin: 50% 0;
  }
  100% {
    opacity: 1;
    -webkit-transform: scale(1);
            transform: scale(1);
  }
}

@keyframes accordionIn {
  0% {
    opacity: 0;
    -webkit-transform: scale(0.9) rotateX(-60deg);
            transform: scale(0.9) rotateX(-60deg);
    -webkit-transform-origin: 50% 0;
            transform-origin: 50% 0;
  }
  100% {
    opacity: 1;
    -webkit-transform: scale(1);
            transform: scale(1);
  }
}

@-webkit-keyframes accordionOut {
  0% {
    opacity: 1;
    -webkit-transform: scale(1);
            transform: scale(1);
  }
  100% {
    opacity: 0;
    -webkit-transform: scale(0.9) rotateX(-60deg);
            transform: scale(0.9) rotateX(-60deg);
  }
}

@keyframes accordionOut {
  0% {
    opacity: 1;
    -webkit-transform: scale(1);
            transform: scale(1);
  }
  100% {
    opacity: 0;
    -webkit-transform: scale(0.9) rotateX(-60deg);
            transform: scale(0.9) rotateX(-60deg);
  }
}

// よくある質問のアコーディオン

jQuery(function(){
  var d = document,
  accordionToggles = d.querySelectorAll('.js-accordionTrigger'),
  setAria,
  setAccordionAria,
  switchAccordion,
  touchSupported = ('ontouchstart' in window),
  pointerSupported = ('pointerdown' in window);
  skipClickDelay = function(e){
    e.preventDefault();
    e.target.click();
  }

  setAriaAttr = function(el, ariaType, newProperty){
      el.setAttribute(ariaType, newProperty);
    };
  setAccordionAria = function(el1, el2, expanded){
    switch(expanded) {
      case "true":
      setAriaAttr(el1, 'aria-expanded', 'true');
      setAriaAttr(el2, 'aria-hidden', 'false');
      break;
      case "false":
      setAriaAttr(el1, 'aria-expanded', 'false');
      setAriaAttr(el2, 'aria-hidden', 'true');
      break;
      default:
      break;
    }
  };
//function
switchAccordion = function(e) {
  console.log("triggered");
  e.preventDefault();
  var thisAnswer = e.target.parentNode.nextElementSibling;
  var thisQuestion = e.target;
  if(thisAnswer.classList.contains('is-collapsed')) {
  setAccordionAria(thisQuestion, thisAnswer, 'true');
  } else {
    setAccordionAria(thisQuestion, thisAnswer, 'false');
  }
  thisQuestion.classList.toggle('is-collapsed');
  thisQuestion.classList.toggle('is-expanded');
  thisAnswer.classList.toggle('is-collapsed');
  thisAnswer.classList.toggle('is-expanded');
  thisAnswer.classList.toggle('animateIn');
  };
  for (var i=0,len=accordionToggles.length; i<len; i++) {
    if(touchSupported) {
      accordionToggles[i].addEventListener('touchstart', skipClickDelay, false);
    }
    if(pointerSupported){
      accordionToggles[i].addEventListener('pointerdown', skipClickDelay, false);
    }
    accordionToggles[i].addEventListener('click', switchAccordion, false);
  }
})();