pure css accordion
                                HTML<div id="container">
<!-- Item 1 -->
  <div class="accordion">
    <label for="tm" class="accordionitem">
    <h2>Item 1 <span class="arrow">»</span></h2></label>
    <input type="checkbox" id="tm"/>
    <p class="hiddentext">One morning, when Gregor Samsa woke from troubled dreams, he found himself transformed in his bed  into a horrible vermin. He lay on his armour-like back, and if he lifted his head a little he could see his brown belly, slightly domed and divided by arches into stiff sections.</p>
  </div>
  
  <!-- Item 2 -->
  <div class="accordion">
    <label for="tn" class="accordionitem">
    <h2>Item 2 <span class="arrow">»</span></h2></label>
    <input type="checkbox" id="tn"/>
    <p class="hiddentext">One morning, when Gregor Samsa woke from troubled dreams, he found himself transformed in his bed into a horrible vermin. He lay on his armour-like back, and if he lifted his head a little he could see his brown belly, slightly domed and divided by arches into stiff sections.</p>
  </div>
  
  <!-- Item 3 -->
  <div class="accordion">
    <label for="to" class="accordionitem">
    <h2>Item 3 <span class="arrow">»</span></h2></label>
    <input type="checkbox" id="to"/>
    <p class="hiddentext">One morning, when Gregor Samsa woke from troubled dreams, he found himself transformed in his bed into a horrible vermin. He lay on his armour-like back, and if he lifted his head a little he could see his brown belly, slightly domed and divided by arches into stiff sections.</p>
  </div>
</div>