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HTML 

              
                <section id="how-to">
        <!-- Super Accordion -->
      <div class="panel-group" id="superaccordion">
        <!-- Accordion 1 -->
        <div class="panel">
          <div class="panel-heading parent">
              <a class="accordion-toggle" data-toggle="collapse" data-parent="#superaccordion" href="#collapse1" aria-expanded="false">
                <img src="https://s3-ap-southeast-1.amazonaws.com/media.go-jek.com/gopay_platformicon/bca.jpg" class="img-responsive" width="100px">
              </a>
          </div>
          <div id="collapse1" class="panel-collapse collapse">
            <div class="panel-body">
              <div class="panel-group" id="accordion1">
                <div class="panel">
                  <div class="panel-heading child">
                    <h4 class="panel-title">
                      <a class="accordion-toggle" data-toggle="collapse" data-parent="#accordion1" href="#collapse1A" aria-expanded="false">ATM BCA
                      </a>
                    </h4>
                  </div>
                  <div id="collapse1A" class="panel-collapse collapse">
                    <div class="panel-body">
                      <div class="inside-body">
                        <ol class="list-group vertical-steps">
                          <li class="list-group-item"><span>Masukkan kartu ATM dan PIN BCA Anda</span></li>
                          <li class="list-group-item"><span>Masuk ke menu TRANSFER dan klik BCA Virtual Account</span</li>
                          <li class="list-group-item"><span>Masukkan kode perusahaan untuk GO-JEK: 70001 dan nomor telepon yang terdaftar pada aplikasi (Contoh: 700010812XXXXXX)</span></li>
                          <li class="list-group-item"><span>Masukkan jumlah top up yang diinginkan</span></li>
                          <li class="list-group-item"><span>Ikuti instruksi untuk menyelesaikan transaksi</span></li>
                        </ol>
                      </div>
                    </div>
                  </div>
                </div>
                <div class="panel">
                  <div class="panel-heading child">
                    <h4 class="panel-title">
                      <a class="accordion-toggle" data-toggle="collapse" data-parent="#accordion1" href="#collapse1B" aria-expanded="false">Collapsible Group Item #3.2
                      </a>
                    </h4>
                  </div>
                  <div id="collapse1B" class="panel-collapse collapse">
                    <div class="panel-body">
                      <div class="inside-body">
                      Konten
                      </div>
                    </div>
                  </div>
                </div>
              </div>
            </div>
          </div>
        </div>
        <!-- End of Accordion 1 -->
        <!-- Accordion 2 -->
        <div class="panel">
          <div class="panel-heading parent">
              <a class="accordion-toggle" data-toggle="collapse" data-parent="#superaccordion" href="#collapse2" aria-expanded="false">
                <img src="https://s3-ap-southeast-1.amazonaws.com/media.go-jek.com/gopay_platformicon/mandiri.jpg" class="img-responsive" width="100px">
              </a>
          </div>
          <div id="collapse2" class="panel-collapse collapse">
            <div class="panel-body">
              <div class="panel-group" id="accordion2">
                <div class="panel">
                  <div class="panel-heading child">
                    <h4 class="panel-title">
                      <a class="accordion-toggle" data-toggle="collapse" data-parent="#accordion2" href="#collapse2A" aria-expanded="false">Collapsible Group Item #3.1
                      </a>
                    </h4>
                  </div>
                  <div id="collapse2A" class="panel-collapse collapse">
                    <div class="panel-body">
                      <div class="inside-body">
                        <ol class="list-group vertical-steps">
                          <li class="list-group-item"><span>Masukkan kartu ATM dan PIN BCA Anda</span></li>
                          <li class="list-group-item"><span>Masuk ke menu TRANSFER dan klik BCA Virtual Account</span</li>
                          <li class="list-group-item"><span>Masukkan kode perusahaan untuk GO-JEK: 70001 dan nomor telepon yang terdaftar pada aplikasi (Contoh: 700010812XXXXXX)</span></li>
                          <li class="list-group-item"><span>Masukkan jumlah top up yang diinginkan</span></li>
                          <li class="list-group-item"><span>Ikuti instruksi untuk menyelesaikan transaksi</span></li>
                        </ol>
                      </div>
                    </div>
                  </div>
                </div>
                <div class="panel">
                  <div class="panel-heading child">
                    <h4 class="panel-title">
                      <a class="accordion-toggle" data-toggle="collapse" data-parent="#accordion2" href="#collapse2B" aria-expanded="false">Collapsible Group Item #3.2
                      </a>
                    </h4>
                  </div>
                  <div id="collapse2B" class="panel-collapse collapse">
                    <div class="panel-body">
                      <div class="inside-body">
                      Konten
                      </div>
                    </div>
                  </div>
                </div>
              </div>
            </div>
          </div>
        </div>
        <!-- End of Accordion 2 -->
      </div>
      <!-- End of Super Accordion -->
    </section>
!

CSS 

              
                body{
  padding:20px;
  background-color: #ecf0f1;
}

/*Vertical Steps*/
.inside-body{
  padding:25px;
}
.list-group.vertical-steps .list-group-item{
  border:none;
  border-left:3px solid #0052c2;
  box-sizing:border-box;
  border-radius:0;
  counter-increment: step-counter;
  padding-left:20px;
  padding-right:0px;
  padding-bottom:20px;
  padding-top:0px;
}
.list-group.vertical-steps .list-group-item.active{
  background-color:transparent;
  color:inherit;
}
.list-group.vertical-steps .list-group-item:last-child{
  border-left:3px solid transparent;
  padding-bottom:0;
}
.list-group.vertical-steps .list-group-item::before {
  border-radius: 50%;
  background-color:#0052c2;
  color:#fff;
  content: counter(step-counter);
  display:inline-block;
  float:left;
  height:25px;
  line-height:25px;
  margin-left:-35px;
  text-align:center;
  width:25px;
}
.list-group.vertical-steps .list-group-item span,
.list-group.vertical-steps .list-group-item a{
  display:block;
  overflow:hidden;
  padding-top:2px;
}
/* End of Vertical Step */

#how-to .panel-group .panel{
  border-radius:0px;
  border: 0px;
}
#how-to .panel-group{
  margin:0px;
}
#how-to .panel-heading{
  padding:0px !important;
  border-radius: 0px;
}
#how-to .parent a{
  display: block;
  text-decoration: none;
  padding:25px;
}
#how-to .child a{
  display: block;
  text-decoration: none;
  padding:25px;
}
#how-to .parent{
  background-color: #fff !important;
}
#how-to .child{
  background-color: #f2f2f2 !important;
}
#how-to .panel-body{
  border: none;
}
#how-to .panel-body{
  padding:0px;
}
#how-to .panel-group .panel+.panel{
  margin:0px;
}
#how-to .panel-group .parent{
  border-bottom: 1px solid #ecf0f1;
}
#how-to .panel-group .child{
  border-bottom: 1px solid #FDFDFD;
}
#superaccordion{
  box-shadow:0 2px 4px 0 rgba(0,0,0,0.16),0 2px 10px 0 rgba(0,0,0,0.12)!important;
}
.panel-heading a:after {
  content: "";
  position: relative;
  top: 1px;
  right:10px;
  display: inline-block;
  font-style: normal;
  font-weight: 700;
  font-size:14pt;
  line-height: 1;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  float: right;
  transition: transform .25s linear;
  -webkit-transition: -webkit-transform .25s linear;
  color:#333;
}
.panel-heading a[aria-expanded="true"]:after {
  content: "\2212";
  -webkit-transform: rotate(180deg);
  transform: rotate(180deg);
}
.panel-heading a[aria-expanded="false"]:after {
  content: "\002b";
  -webkit-transform: rotate(90deg);
  transform: rotate(90deg);
}
.parent a:after{
  content: "";
  position: relative;
  top: -15px;
  right:10px;
  display: inline-block;
  line-height: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  float: right;
  transition: transform .25s linear;
  -webkit-transition: -webkit-transform .25s linear;
  color:#333;
}
!

JS
!
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