CSS, Javascript | Type: CSSCSS-only Accordians

When javascript doesn’t make the grade.

HTML

<div class="wrapper">
<div class="half">
<p>Open <strong>multiple</strong></p>
<div class="tab"><input id="tab-one" name="tabs" type="checkbox" /> <!--can open several tabs at once--> 
<label for="tab-one">Label One</label>
<div class="tab-content">
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Tenetur, architecto, explicabo perferendis nostrum, maxime impedit atque odit sunt pariatur illo obcaecati soluta molestias iure facere dolorum adipisci eum? Saepe, itaque.</p>
</div>
</div>
<div class="tab"><input id="tab-two" name="tabs" type="checkbox" /> 
<label for="tab-two">Label Two</label>
<div class="tab-content">
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Tenetur, architecto, explicabo perferendis nostrum, maxime impedit atque odit sunt pariatur illo obcaecati soluta molestias iure facere dolorum adipisci eum? Saepe, itaque.</p>
</div>
</div>
<div class="tab"><input id="tab-three" name="tabs" type="checkbox" /> 
<label for="tab-three">Label Three</label>
<div class="tab-content">
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Tenetur, architecto, explicabo perferendis nostrum, maxime impedit atque odit sunt pariatur illo obcaecati soluta molestias iure facere dolorum adipisci eum? Saepe, itaque.</p>
</div>
</div>
</div>
<div class="half">
<p>Open <strong>one</strong></p>
<div class="tab blue"><input id="tab-four" name="tabs2" type="radio" /> <!--opening one tab closes another--> 
<label for="tab-four">Label One</label>
<div class="tab-content">
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Tenetur, architecto, explicabo perferendis nostrum, maxime impedit atque odit sunt pariatur illo obcaecati soluta molestias iure facere dolorum adipisci eum? Saepe, itaque.</p>
</div>
</div>
<div class="tab blue"><input id="tab-five" name="tabs2" type="radio" /> 
<label for="tab-five">Label Two</label>
<div class="tab-content">
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Tenetur, architecto, explicabo perferendis nostrum, maxime impedit atque odit sunt pariatur illo obcaecati soluta molestias iure facere dolorum adipisci eum? Saepe, itaque.</p>
</div>
</div>
<div class="tab blue"><input id="tab-six" name="tabs2" type="radio" /> 
<label for="tab-six">Label Three</label>
<div class="tab-content">
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Tenetur, architecto, explicabo perferendis nostrum, maxime impedit atque odit sunt pariatur illo obcaecati soluta molestias iure facere dolorum adipisci eum? Saepe, itaque.</p>
</div>
</div>
</div>
</div>

CSS

/* Acordeon styles */
.tab {
  position: relative;
  margin-bottom: 1px;
  width: 100%;
  color: #fff;
  overflow: hidden;
}
.tab input {
  position: absolute;
  opacity: 0;
  z-index: -1;
}
.tab label {
  position: relative;
  display: block;
  padding: 0 0 0 1em;
  background: #16a085;
  font-weight: bold;
  line-height: 3;
  cursor: pointer;
}
.blue label {
  background: #2980b9;
}
.tab-content {
  max-height: 0;
  overflow: hidden;
  background: #1abc9c;
  -webkit-transition: max-height .35s;
  -o-transition: max-height .35s;
  transition: max-height .35s;
}
.blue .tab-content {
  background: #3498db;
}
.tab-content p {
  margin: 1em;
}
/* :checked */
.tab input:checked ~ .tab-content {
  max-height: 100vh;
}
/* Icon */
.tab label::after {
  position: absolute;
  right: 0;
  top: 0;
  display: block;
  width: 3em;
  height: 3em;
  line-height: 3;
  text-align: center;
  -webkit-transition: all .35s;
  -o-transition: all .35s;
  transition: all .35s;
}
.tab input[type=checkbox] + label::after {
  content: "+";
}
.tab input[type=radio] + label::after {
  content: "BC";
}
.tab input[type=checkbox]:checked + label::after {
  transform: rotate(315deg);
}
.tab input[type=radio]:checked + label::after {
  transform: rotateX(180deg);
}

Reference Links

https://codepen.io/raubaca/pen/PZzpVe