<div class="panel-group accordion_1" id="accordion1">
  <div class="panel panel-default">
    <div class="panel-heading">
      <h4 class="panel-title"> <a data-toggle="collapse" data-parent="#accordion1" href="#collapse1_1">
        <span class="accordion_icon"></span>
        what we do ?</a> </h4>
    </div>
    <div id="collapse1_1" class="panel-collapse collapse in">
      <div class="panel-body">Content Text 1 ... </div>
    </div>
  </div>
  <div class="panel panel-default">
    <div class="panel-heading">
      <h4 class="panel-title"> <a data-toggle="collapse" data-parent="#accordion1" href="#collapse1_2" class="collapsed">
        <span class="accordion_icon"></span>
        Responsive design </a> </h4>
    </div>
    <div id="collapse1_2" class="panel-collapse collapse">
      <div class="panel-body">Content Text 2 ... </div>
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  </div>
  <div class="panel panel-default">
    <div class="panel-heading">
      <h4 class="panel-title"> <a data-toggle="collapse" data-parent="#accordion1" href="#collapse1_3" class="collapsed">
        <span class="accordion_icon"></span>
        Browser compatibility </a> </h4>
    </div>
    <div id="collapse1_3" class="panel-collapse collapse">
      <div class="panel-body">Content Text 3 ... </div>
    </div>
  </div>
</div>

<div class="panel-group accordion_3" id="accordion3">
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    <div class="panel-heading">
      <h4 class="panel-title"> <a data-toggle="collapse" data-parent="#accordion3" href="#collapse3_1"><span class="accordion_icon"></span>what we do ?</a> </h4>
    </div>
    <div id="collapse3_1" class="panel-collapse collapse in">
      <div class="panel-body">Content Text 1 ...  </div>
    </div>
  </div>
  <div class="panel panel-default">
    <div class="panel-heading">
      <h4 class="panel-title"> <a data-toggle="collapse" data-parent="#accordion3" href="#collapse3_2" class="collapsed"><span class="accordion_icon"></span>Responsive design </a> </h4>
    </div>
    <div id="collapse3_2" class="panel-collapse collapse">
      <div class="panel-body">Content Text 2 ...  </div>
    </div>
  </div>
  <div class="panel panel-default">
    <div class="panel-heading">
      <h4 class="panel-title"> <a data-toggle="collapse" data-parent="#accordion3" href="#collapse3_3" class="collapsed"><span class="accordion_icon"></span>Browser compatibility </a> </h4>
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    <div id="collapse3_3" class="panel-collapse collapse">
      <div class="panel-body">Content Text 3 ...  </div>
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<div class="panel-group accordion_5" id="accordion5">
  <div class="panel panel-default">
    <div class="panel-heading">
      <h4 class="panel-title"> <a data-toggle="collapse" data-parent="#accordion5" href="#collapse5_1"><span class="accordion_icon"></span>what we do ?</a> </h4>
    </div>
    <div id="collapse5_1" class="panel-collapse collapse in">
      <div class="panel-body">Content Text 1 ...</div>
    </div>
  </div>
  <div class="panel panel-default">
    <div class="panel-heading">
      <h4 class="panel-title"> <a data-toggle="collapse" data-parent="#accordion5" href="#collapse5_2" class="collapsed"><span class="accordion_icon"></span>Responsive design </a> </h4>
    </div>
    <div id="collapse5_2" class="panel-collapse collapse">
      <div class="panel-body">Content Text 1 ...</div>
    </div>
  </div>
  <div class="panel panel-default">
    <div class="panel-heading">
      <h4 class="panel-title"> <a data-toggle="collapse" data-parent="#accordion5" href="#collapse5_3" class="collapsed"><span class="accordion_icon"></span>Browser compatibility </a> </h4>
    </div>
    <div id="collapse5_3" class="panel-collapse collapse">
      <div class="panel-body">Content Text 1 ...</div>
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<div class="panel-group accordion_2" id="accordion2">
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    <div class="panel-heading">
      <h4 class="panel-title"> <a data-toggle="collapse" data-parent="#accordion2" href="#collapse2_1">
        <span class="accordion_icon"></span>
        what we do ?</a> </h4>
    </div>
    <div id="collapse2_1" class="panel-collapse collapse in">
      <div class="panel-body">Content Text 1 ... </div>
    </div>
  </div>
  <div class="panel panel-default">
    <div class="panel-heading">
      <h4 class="panel-title"> <a data-toggle="collapse" data-parent="#accordion2" href="#collapse2_2" class="collapsed">
        <span class="accordion_icon"></span>
        Responsive design </a> </h4>
    </div>
    <div id="collapse2_2" class="panel-collapse collapse">
      <div class="panel-body">Content Text 2 ... </div>
    </div>
  </div>
  <div class="panel panel-default">
    <div class="panel-heading">
      <h4 class="panel-title"> <a data-toggle="collapse" data-parent="#accordion2" href="#collapse2_3" class="collapsed">
        <span class="accordion_icon"></span>
        Browser compatibility </a> </h4>
    </div>
    <div id="collapse2_3" class="panel-collapse collapse">
      <div class="panel-body">Content Text 3 ... </div>
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</div>

<div class="panel-group accordion_4" id="accordion4">
  <div class="panel panel-default">
    <div class="panel-heading">
      <h4 class="panel-title"> <a data-toggle="collapse" data-parent="#accordion4" href="#collapse4_1"><span class="accordion_icon"></span>what we do ?</a> </h4>
    </div>
    <div id="collapse4_1" class="panel-collapse collapse in">
      <div class="panel-body">Lorem ipsu dolor sit amet, consectetur elit. dictum felis eu pedeLorem ipsu dolor sit amet, consectetur adipisicing elit. Lorem ipsu dolor sit amet, consectetur elit. dictum felis eu pedeLorem ipsu dolor sit amet, consectetur adipisicing elit. </div>
    </div>
  </div>
  <div class="panel panel-default">
    <div class="panel-heading">
      <h4 class="panel-title"> <a data-toggle="collapse" data-parent="#accordion4" href="#collapse4_2" class="collapsed"><span class="accordion_icon"></span>Responsive design </a> </h4>
    </div>
    <div id="collapse4_2" class="panel-collapse collapse">
      <div class="panel-body">Lorem ipsu dolor sit amet, consectetur elit. dictum felis eu pedeLorem ipsu dolor sit amet, consectetur adipisicing elit. Lorem ipsu dolor sit amet, consectetur elit. dictum felis eu pedeLorem ipsu dolor sit amet, consectetur adipisicing elit. </div>
    </div>
  </div>
  <div class="panel panel-default">
    <div class="panel-heading">
      <h4 class="panel-title"> <a data-toggle="collapse" data-parent="#accordion4" href="#collapse4_3" class="collapsed"><span class="accordion_icon"></span>Browser compatibility </a> </h4>
    </div>
    <div id="collapse4_3" class="panel-collapse collapse">
      <div class="panel-body">Lorem ipsu dolor sit amet, consectetur elit. dictum felis eu pedeLorem ipsu dolor sit amet, consectetur adipisicing elit. Lorem ipsu dolor sit amet, consectetur elit. dictum felis eu pedeLorem ipsu dolor sit amet, consectetur adipisicing elit. </div>
    </div>
  </div>
</div>

<div class="panel-group accordion_6" id="accordion6">
  <div class="panel panel-default">
    <div class="panel-heading">
      <h4 class="panel-title"> <a data-toggle="collapse" data-parent="#accordion6" href="#collapse6_1"><span class="accordion_icon"></span>what we do ?</a> </h4>
    </div>
    <div id="collapse6_1" class="panel-collapse collapse in">
      <div class="panel-body">Content Text 1 ... </div>
    </div>
  </div>
  <div class="panel panel-default">
    <div class="panel-heading">
      <h4 class="panel-title"> <a data-toggle="collapse" data-parent="#accordion6" href="#collapse6_2" class="collapsed"><span class="accordion_icon"></span>Responsive design </a> </h4>
    </div>
    <div id="collapse6_2" class="panel-collapse collapse">
      <div class="panel-body">Content Text 1 ... </div>
    </div>
  </div>
  <div class="panel panel-default">
    <div class="panel-heading">
      <h4 class="panel-title"> <a data-toggle="collapse" data-parent="#accordion6" href="#collapse6_3" class="collapsed"><span class="accordion_icon"></span>Browser compatibility </a> </h4>
    </div>
    <div id="collapse6_3" class="panel-collapse collapse">
      <div class="panel-body">Content Text 1 ... </div>
    </div>
  </div>
</div>