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HTML 

              
                <h1 class="title"><strong>No Boostrap</strong> ｜ jQuery Animated Accordions</h1>

<div class="container">
  
  <div id="accordion-1">
    <div class="head">
      <h2>1. Simple Accordion</h2>
      <i class="fas fa-angle-down arrow"></i>
    </div>
    <div class="content">
      <p>An accordion is used to show and hide content. It can be usually found in Q & A section.</p>
    </div>
  </div>
  
  <br>
  
  <div id="accordion-2">
    <div class="head">
      <h2>2. Tree-like Multiple Accordion</h2>
      <i class="fas fa-angle-down arrow"></i>
    </div>
    <div class="content">
      <p>Such accordion emphasizes hierarchy.</p>
    </div>
    <div class="content">
      <p>Such accordion emphasizes hierarchy.</p>
    </div>
    <div class="content">
      <p>Such accordion emphasizes hierarchy.</p>
    </div>
  </div>
  
  <br>
  
  <div id="accordion-3">
    <div class="head">
      <h2>3. Chatbox-like Accordion</h2>
      <i class="arrow"></i>
    </div>
    <div class="content">
      <p>An accordion is used to show and hide content. It can be usually found in Q & A section.</p>
    </div>
  </div>
  
</div>

<p class="remarks">Created By <a href="https://codepen.io/nikoso">Niko</a></p>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Lato:300,900);

body{
  font-family: Lato;
  background: #FFF;
  height: 1000px;
}

h1.title{
  text-align: center;
  font-size: 40px;
  color: #282828;
  font-weight: 300;
  margin-bottom: 2.5rem;
}

b{
  color: #FFFFFF;
  font-size: 55px;
}

p.remarks, a{
  text-align: center;
  margin-top: 100px;
  color: #FFFFFF;
}

.container{
  width: 100%;
  max-width: 650px;
  min-width: 300px;
  margin: 0 auto;
  padding: 0 5vh;
}

/* accordion-1 */
#accordion-1{
  position: relative;
}

#accordion-1 .head{
  background-color: #6e2fdf;
  color: #FFFFFF;
  padding: 20px 30px;
  cursor: pointer;
  transition: 0.2s ease;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

#accordion-1 .arrow{
  color: #FFFFFF;
  font-size: 60px;
  transition: 0.25s ease;
  opacity: 0.3;
  transform: rotate(-90deg);
}

#accordion-1 .head:hover .arrow{
  opacity: 1;
}

#accordion-1 .head:hover, #accordion-1 .active{
  background-color: #3e0891;
}

#accordion-1 .arrow-animate{
  transform: rotate(-180deg);
  opacity: 1;
}

#accordion-1 .content{
  background-color: #F3EDFF;
  display: none;
  padding: 20px 30px;
  color: #222222;
}

/* accordion-2 */
#accordion-2{
  position: relative;
}

#accordion-2 .head{
  background-color: #6e2fdf;
  color: #FFFFFF;
  padding: 1rem 2rem;
  cursor: pointer;
  transition: 0.2s ease;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

#accordion-2 .arrow{
  color: #FFFFFF;
  font-size: 60px;
  transition: 0.25s ease;
  opacity: 0.3;
  transform: rotate(-90deg);
}

#accordion-2 .head:hover .arrow{
  opacity: 1;
}

#accordion-2 .arrow-animate{
  transform: rotate(-180deg);
  opacity: 1;
}

#accordion-2 .content{
  background-color: #F3EDFF;
  display: none;
  padding: 1rem 4rem;
  color: #222222;
  position: relative;
}

#accordion-2 .content:nth-child(odd){
  background-color: #EAE0FB;
}

#accordion-2 .content::before{
  content: "";
  width: 4px;
  position: absolute;
  background-color: #3e0891;
  top: 0;
  left: 2.4rem;
  height: 100%;
  animation: vertical-fade-in forwards 1s;
  animation-delay; 200ms;
}

@keyframes vertical-fade-in{
  from{
    opacity: 0;
  }
  to{
    opacity: 1;
  }
}

#accordion-2 .content::after{
  content: "";
  height: 4px;
  position: absolute;
  background-color: #3e0891;
  top: 50%;
  left: 2.4rem;
  animation: horizontal-fade-in forwards 1s;
  animation-delay: 300ms;
}

@keyframes horizontal-fade-in{
  from{
    opacity: 0;
    width: 0;
  }
  to{
    opacity: 1;
    width: 1rem;
  }
}

#accordion-2 .head:hover, #accordion-2 .active{
  background-color: #3e0891; 
}

/* accordion-3 */
#accordion-3{
  position: relative;
}

#accordion-3 .head{
  background-color: #6e2fdf;
  color: #FFFFFF;
  padding: 20px 30px;
  cursor: pointer;
  transition: 0.25s;
}

#accordion-3 .arrow{
  content:'';
  position: absolute;
  right: 0;
  right: 30px;
  top: 65px;
  opacity: 1;
  border-left: 35px solid transparent;
  border-right: 35px solid transparent;
  border-top: 40px solid #6e2fdf;
  transition: 0.3s ease;
  z-index: 2;
}

#accordion-3 .head:hover .arrow, #accordion-3 .arrow-animate{
  border-top: 40px solid #3e0891;
  transform: translateY(40px);
}

#accordion-3 .content{
  background-color: #F3EDFF;
  display: none;
  padding: 30px;
  color: #222222;
}

#accordion-3 .head:hover, #accordion-3 .active{
  background-color: #3e0891; 
}
!

JS 

              
                $('.head').click(function(){
  $(this).toggleClass('active');
  $(this).parent().find('.arrow').toggleClass('arrow-animate');
  $(this).parent().find('.content').slideToggle(280);
});

// icon from Font Awesome was used in accordion-1
!
999px

Console