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CSS

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HTML 

              
                <div class="container">
          <div class="accordion">
            <dl>
              <dt>
                <a href="#accordion1" aria-expanded="false" aria-controls="accordion1" class="accordion-title accordionTitle js-accordionTrigger">Country Research</a>
              </dt>
              <dd class="accordion-content accordionItem is-collapsed" id="accordion1" aria-hidden="true">
                <p>Consumer research forms the foundation of many marketing departments. Spire offers both quantitative and qualitative research techniques across all emerging market countries, which we cover.</p>
              </dd>
              <dt class="odd">
                <a href="#accordion2" aria-expanded="false" aria-controls="accordion2" class="accordion-title accordionTitle js-accordionTrigger">Customer Decision Dynamic Analysis</a>
              </dt>
              <dd class="accordion-content accordionItem is-collapsed" id="accordion2" aria-hidden="true">
                <p>Customer purchase decisions are complex. Spire assists companies in deciphering business-to-business and business-to-consumer purchase decision dynamics.</p>
              </dd>
              <dt>
                <a href="#accordion3" aria-expanded="false" aria-controls="accordion3" class="accordion-title accordionTitle js-accordionTrigger">Market Environment Research</a>
              </dt>
              <dd class="accordion-content accordionItem is-collapsed" id="accordion3" aria-hidden="true">
                <p>Whether your company is seeking to grow market share, launch an innovation or enter a new market, Spire offers comprehensive solutions to bring your organisation to greater heights.</p>
              </dd>
            </dl>
          </div>
        </div>
!

CSS 

              
                //updated ver
* {
  box-sizing:border-box;
}
@import url('https://fonts.googleapis.com/css?family=Ubuntu:400,500,700');
body { 

  font-family:'Ubuntu';
}
.heading-primary {
  font-size:2em;
  padding:2em;
  text-align:center;
}
.accordion dl,
.accordion-list {
   border:1px solid #ddd;
   &:after {
       content: "";
       display:block;
       height:1em;
       width:100%;
       background-color:darken(#FF7E00, 10%);
     }
}
.accordion dd,
.accordion__panel {
   background-color:#eee;
   font-size:1em;
   line-height:1.5em; 
}
.accordion p {
  padding:1em 2em 1em 2em;
}

.accordion {
    position:relative;
    background-color:#eee;
}
.container {
  max-width:960px;
  margin:0 auto;
  padding:2em 0 2em 0;
}
.accordionTitle,
.accordion__Heading {
 background-color:#FF7E00; 
   text-align:center;
     font-weight:700; 
          padding:1.2em;
          display:block;
          text-decoration:none;
          color:#fff;
          transition:background-color 0.5s ease-in-out;
          font-size: 18px;
          padding: 0.9em 1.2em;
          font-weight:500; 
  &:before {
   content: "+";
   font-size:1.5em;
   line-height:0.5em;
   float:left; 
   transition: transform 0.3s ease-in-out;
  }
  &:hover {
    background-color:darken(#eda712, 10%);
  }
}
dt.odd .accordionTitle,
dt.odd .accordion__Heading{
  background-color:#eda712;
  &:hover {
    background-color:darken(#eda712, 10%);
  }
}

.accordionTitleActive, 
.accordionTitle.is-expanded {
   background-color:darken(#eda712, 10%);
    &:before {
      transform:rotate(-225deg);
    }
}
.accordionItem {
    height:auto;
    overflow:hidden; 
    //SHAME: magic number to allow the accordion to animate
    
     max-height:50em;
    transition:max-height 1s;   
 
    
    @media screen and (min-width:48em) {
         max-height:15em;
        transition:max-height 0.5s
    }
}
 
.accordionItem.is-collapsed {
    max-height:0;
}
.no-js .accordionItem.is-collapsed {
  max-height: auto;
}
.animateIn {
     animation: accordionIn 0.45s normal ease-in-out both 1; 
}
.animateOut {
     animation: accordionOut 0.45s alternate ease-in-out both 1;
}
@keyframes accordionIn {
  0% {
    opacity: 0;
    transform:scale(0.9) rotateX(-60deg);
    transform-origin: 50% 0;
  }
  100% {
    opacity:1;
    transform:scale(1);
  }
}

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

JS 

              
                //uses classList, setAttribute, and querySelectorAll
//if you want this to work in IE8/9 youll need to polyfill these
(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);
  }
})();
!
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