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CSS Bootstrap 4 Basics (Retired) Building Forms with Bootstrap Custom CSS

Collapsible element Bootstrap 4

What is wrong with this code? Please help. Thank you!

<h1 id="schedule" class="display-4 text-xs-center my-3 text-muted">Schedule</h1>

<div id="accordion" role="tablist" aria-multiselectable="true"> <div class="card"> <div class="card-header" role="tab" id="headingOne">

<img class="media-object rounded-circle" src="img/avatar-nodestradamus.png" alt="Nodestradamus" width="50px"> <h5 class="mb-0">

    <a data-toggle="collapse" data-parent="#accordion" href="#collapseOne" aria-expanded="true" aria-controls="collapseOne">
     Keynote: Internet of Things
    </a>
    <span class="tag tag-info tag-pill float-xs-right">9:00 am</span>
  </h5>
</div>

<div id="collapseOne" class="collapse in" role="tabpanel" aria-labelledby="headingOne">
  <div class="card-block">
   Javascript is everywhere.
  </div>
</div>

</div>

Joey Ward
Joey Ward
Courses Plus Student 24,778 Points

It looks like you've opened one more div than you've closed.