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HTML

              
                <div class="worko-tabs">
  
    <input class="state" type="radio" title="tab-one" name="tabs-state" id="tab-one" checked />
    <input class="state" type="radio" title="tab-two" name="tabs-state" id="tab-two" />
    <input class="state" type="radio" title="tab-three" name="tabs-state" id="tab-three" />
    <input class="state" type="radio" title="tab-four" name="tabs-state" id="tab-four" />

    <div class="tabs flex-tabs">
        <label for="tab-one" id="tab-one-label" class="tab">Tab One</label>
        <label for="tab-two" id="tab-two-label" class="tab">Tab Two</label>
        <label for="tab-three" id="tab-three-label" class="tab">Tab Three</label>
        <label for="tab-four" id="tab-four-label" class="tab">Tab Four</label>


        <div id="tab-one-panel" class="panel active">
          <h3>Responsive CSS Tabs - Flexbox</h3>
          <p>CSS only tabs built using flexbox, when the viewport drops below 600px wide the tabs turn into an accordion by chaging the flex order of the elements.</p>
        </div>
        <div id="tab-two-panel" class="panel">
            Tab two content
        </div>
        <div id="tab-three-panel" class="panel">
            Tab three content
        </div>
        <div id="tab-four-panel" class="panel">
            Tab four content
        </div>
    </div>

</div>
              
            
!

CSS

              
                @import "bourbon";

/* Android 2.3 :checked fix */
@keyframes fake {
    from {
        opacity: 1;
    }
    to {
        opacity: 1;
    }
}
body {        
    animation: fake 1s infinite;
}

.worko-tabs {
    margin: 20px;
  	width: 80%;
  
    .state{
      position: absolute;
      left: -10000px;
    }
  
    .flex-tabs{
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
        
        .tab{
          flex-grow: 1;
          max-height: 40px;
        }
      
        .panel {
          background-color: #fff;
          padding: 20px;
          min-height: 300px;
          display: none;
          width: 100%;
          flex-basis: auto;
      }
    }

    .tab {
      display: inline-block;
      padding: 10px;
      vertical-align: top;
      background-color: #eee;
      cursor: hand;
      cursor: pointer;
      border-left: 10px solid #ccc;
      
        &:hover{
          background-color: #fff;
        }
    }  
}

#tab-one:checked ~ .tabs #tab-one-label,
#tab-two:checked ~ .tabs #tab-two-label,
#tab-three:checked ~ .tabs #tab-three-label,
#tab-four:checked ~ .tabs #tab-four-label{
    background-color: #fff;
    cursor: default;
    border-left-color: #69be28;
}

#tab-one:checked ~ .tabs #tab-one-panel,
#tab-two:checked ~ .tabs #tab-two-panel,
#tab-three:checked ~ .tabs #tab-three-panel,
#tab-four:checked ~ .tabs #tab-four-panel{
    display: block;
}

@media (max-width: 600px){
  .flex-tabs{
    flex-direction: column;
    
    .tab{
      background: #fff;
      border-bottom: 1px solid #ccc;
      
        &:last-of-type{
          border-bottom: none;
        }
    }
    
    #tab-one-label{order:1;}
    #tab-two-label{order: 3;}
    #tab-three-label{order: 5;};
    #tab-four-label{order: 7;};
    #tab-one-panel{order: 2;}
    #tab-two-panel{order: 4;}
    #tab-three-panel{order: 6;}
    #tab-four-panel{ order: 8;}
  }
  
    #tab-one:checked ~ .tabs #tab-one-label,
    #tab-two:checked ~ .tabs #tab-two-label,
    #tab-three:checked ~ .tabs #tab-three-label,
    #tab-four:checked ~ .tabs #tab-four-label{
      border-bottom: none;
    }
  
  #tab-one:checked ~ .tabs #tab-one-panel,
  #tab-two:checked ~ .tabs #tab-two-panel,
  #tab-three:checked ~ .tabs #tab-three-panel,
  #tab-four:checked ~ .tabs #tab-four-panel{
    border-bottom: 1px solid #ccc;
  }
}


              
            
!

JS

              
                //forked from https://codepen.io/artlawry/pen/domFD
              
            
!
999px

Console