How to make use of it:

1. Load  nioicon.css for the expand/collapse icons.

<link rel="stylesheet" href="assets/css/nioicon.css" />

2. Load  nioicon.css for the expand/collapse icons.

<ul class="accordion-list">
  <li class="accordion-list-item open">
    <h5 class="accordion-title">
      Accordion 1
      <span class="ni ni-minus"></span>
    </h5>
    <div class="accordion-desc">
      <p>
        Accordion 1 Content (Open On Page Load)
      </p>
    </div>
  </li>
  <li class="accordion-list-item">
    <h5 class="accordion-title">
      Accordion 2
      <span class="ni ni-minus"></span>
    </h5>
    <div class="accordion-desc">
      <p>
        Accordion 2 Content
      </p>
    </div>
  </li>
  <li class="accordion-list-item open">
    <h5 class="accordion-title">
      Accordion 3
      <span class="ni ni-minus"></span>
    </h5>
    <div class="accordion-desc">
      <p>
        Accordion 3 Content
      </p>
    </div>
  </li>
  ...
</ul>

3. The most important JavaScript (jQuery script) to activate the accordion.

$(function () {
  if ($('.accordion-list').length) {
    $('.accordion-list').on('click', '.accordion-title', function (e) {
      e.preventDefault();
      // remove siblings activities
      $(this).closest('.accordion-list-item').siblings().removeClass('open').find('.accordion-desc').slideUp();
      $(this).closest('.accordion-list-item').siblings().find('.ni').addClass('ni-plus').removeClass('ni-minus');

      // add slideToggle into this
      $(this).closest('.accordion-list-item').toggleClass('open').find('.accordion-desc').slideToggle();
      $(this).find('.ni').toggleClass('ni-plus ni-minus');
    });
  }
});

4. Apply CSS styles to the accordion.

.accordion-list {
  /* your styles here */
}

.accordion-title {
  /* your styles here */
}

.accordion-desc {
  /* your styles here */
}

Simple Pretty Accordion Component, jquery petty accordion Plugin/Github, jquery accordion open and close on click

See Demo And Download