Simple Jquery Accordion #accordion

common.js

  $(function() {
    $('.acc-btn').click(function() {
      $('.acc-content').slideUp('normal');
      $('.acc-btn').removeClass('acc-active');
      if ($(this).next().is(':visible') == true) {
        $('.acc-btn').removeClass('active');
      }
      if ($(this).next().is(':hidden') == true) {
        $(this).next().slideDown('normal');
        $(this).addClass('acc-active');
      }
      $('.acc-content').one().removeClass('show');
    });

    $('.acc-content').hide();
    $('.show').show();
  });

Simple Jquery Accordion

<div>
  <div class="acc-btn">Button 1</div>
  <div class="acc-content">
    Content 1
  </div>
</div>
<div>
  <div class="acc-btn">Button 2</div>
  <div class="acc-content show">
    Content 2
  </div>
</div>
<div>
  <div class="acc-btn">Button 3</div>
  <div class="acc-content">
    Content 3
  </div>
</div>

style.css

.acc-btn {
  display: block;
  position: relative;
  margin-bottom: -2px;
  border-radius: 0;
  color: #fff !important;
  background: #FF9000;
  border: 1px solid #Fff;
  padding: 10px 15px;
  border-bottom: 1px solid transparent;
  font-size: 18px;
  color: inherit;
  cursor: pointer;
}

.acc-content {
  padding: 15px;
}

.acc-btn:before {
  position: absolute;
  top: 50%;
  right: 15px;
  font-size: 18px;
  z-index: 9999;
  margin-top: -13px;
  font-family: FontAwesome;
  content: "\f078";
  color: #fff;
}

.acc-active:before {
  font-family: FontAwesome;
  content: "\f077";
}