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HTML

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CSS

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CSS Base

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HTML 

              
                <div style="width: 700px; margin: 0 auto;">
  <ul>
    <li><a href="">Link to First Tab</a></li>
    <li><a href="">Link to Second Tab</a></li>
    <li><a href="">Link to Third Tab</a></li>
    <li><a href="">Link to Fourth Tab</a></li>
  </uL> 
</div>

<div style="height:300px;"></div>


<!-- 
ORIGINAL BY RENA.TO 
https://codepen.io/renatorib/pen/rlpfj
-->

<div class="pc-tab">
<input checked="checked" id="tab1" type="radio" name="pct" />
<input id="tab2" type="radio" name="pct" />
<input id="tab3" type="radio" name="pct" />
<input id="tab4" type="radio" name="pct" />  
  <div class="tabs">
  <nav>
    <ul>
      <li class="tab1">
        <label for="tab1">First Tab</label>
      </li>
      <li class="tab2">
        <label for="tab2">Second Tab</label>
      </li>
      <li class="tab3">
        <label for="tab3">Third Tab</label>
      </li>
      <li class="tab4">
        <label for="tab4">Fourth Tab</label>
      </li>
    </ul>
  </nav>
  </div> 
  
  <div class="tab_container">
  <div class="tab_content">
    
    <div class="tab1">
      <p class="title>">First</p>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Repellendus itaque quidem minus nostrum, voluptatem accusamus aspernatur quia harum ratione, officia laudantium inventore autem doloribus atque labore numquam non. Hic, animi.</p>
    </div>
    
    <div class="tab2">
      <p class="title>">Second</p>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Laborum nesciunt ipsum dolore error repellendus officiis aliquid a, vitae reprehenderit, accusantium vero, ad. Obcaecati numquam sapiente cupiditate. Praesentium eaque, quae error!</p>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Perferendis, maiores.</p>
    </div>
    
    <div class="tab3">
      <p class="title>">Third</p>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit.</p>
    </div>
    
    <div class="tab4">
      <h2>Fourth</h2>
      <p> afdadfadfadfad Lorem ipsum dolor sit amet, consectetur adipisicing elit. Optio, nobis culpa rem, vitae earum aliquid.</p>
    </div>
    
  </div>
  </div>
  
</div>
  


<div style="height:1000px;"></div>
!

CSS 

              
                /* Component Needs */

.pc-tab input,
.pc-tab .tab_content > div {
  display: none;
}

#tab1:checked ~ .tab_container .tab1,
#tab2:checked ~ .tab_container .tab2,
#tab3:checked ~ .tab_container .tab3,
#tab4:checked ~ .tab_container .tab4{
  display: block;
}

#tab1:checked ~ .tabs nav .tab1,
#tab2:checked ~ .tabs nav .tab2,
#tab3:checked ~ .tabs nav .tab3,
#tab4:checked ~ .tabs nav .tab4{
  color: orange;
}

/* Visual Styles */

$activeColor: transparent; /* #ffffff */
$unactiveColor: #eeeeee;
$unactiveHoverColor: red; /* #dddddd */
$offsetHeight: 50px;


*, *:after, *:before {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

body {
  background: #ecf0f1;
}

h1 {
  text-align: center;
  font-weight: 100;
  font-size: 60px;
  color: #e74c3c;
}

.pc-tab { 
  width: 100%;
  max-width: 700px;
  margin: 0 auto;
 .tabs ul {
    list-style: none;
    margin: 0;
    padding: 0;
    li {
      label {
        font-family: "Raleway";
        float: left;
        padding: 15px 25px;
        border: 1px solid #ddd;
        border-bottom: 0;
        background: $unactiveColor;
        color: #444;
        &:hover {
          background: $unactiveHoverColor;
        }
        &:active {
          background: $activeColor;
        }
        /* &:not(:active) {
          background: $unactiveColor;
        } */
      }
      &:not(:last-child) label {
         border-right-width: 0; 
      }
    }
  }
  

  
  .tab_content {
    font-family: "Droid Serif";
    clear: both;
    div {
      padding-top: calc(20px + #{$offsetHeight});
      padding-right: 20px;
      padding-left: 20px;
      padding-bottom: 20px;
      
      width: 100%;
      border: 1px solid #ddd;
      /* background: #fff; */
      line-height: 1.5em;
      letter-spacing: 0.3px;
      color: #444;
      h2 {
        margin: 0;
        font-family: "Raleway";
        letter-spacing: 1px;
        color: #34495e;
      }
    }
  }
}

#tab1:checked ~ .tabs nav .tab1,
#tab2:checked ~ .tabs nav .tab2,
#tab3:checked ~ .tabs nav .tab3,
#tab4:checked ~ .tabs nav .tab4{
  label {
    background: transparent;
    color: #111;
    position: relative;
    &:after {
      content: '';
      display: block;
      position: absolute;
      height: 2px;
      width: 100%;
      background: $activeColor;
      left: 0;
      bottom: -1px;
    }
  }
}

label {
  width: calc(100% / 4);
  box-sizing: border-box;
  text-align: center;
  height: $offsetHeight;
  }

nav {
}

.tab_content .tab1 {
  background-color: pink;
  }

.tab_content .tab2 {
  background-color: lightblue;
  }

.tab_content .tab3 {
  background-color: lightyellow;
  }

.tab_content .tab4 {
  background-color: lightgreen;
  }

.tabs {
  height: 100%;
  display: table;
  width: 100%;
  margin-bottom: -$offsetHeight;
  position: relative;
  }

.tab_container {
  width: 100%;
  height: 0;
  padding-bottom: 50%;
  position: relative;
  z-index: -1;
}

.tab_content {
  position: absolute;
  height: 100%;
  width: 100%;
}

.tab_content div {
  height: 100%;
}
!

JS 

              
                // PURE CSS TABS.
// 0 js lines.
!
999px

Console