How to make a Bootstrap v4 accordion collapse when clicking the whole header div?

add this style to your css

.mb-0 > a {
  display: inline-block;
  width: 100%;
  padding:0.75rem 1.25rem;
}
.card-header {
  padding:0;
}

Try with demo , run the snippet and click full screen view

.mb-0 > a {
  display: inline-block;
  width: 100%;
  padding:0.75rem 1.25rem;
}
.card-header {
  padding:0;
}
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.5/css/bootstrap.min.css" integrity="sha384-AysaV+vQoT3kOAXZkl02PThvDr8HYKPZhNT5h/CXfBThSRXQ6jW5DO2ekP5ViFdi" crossorigin="anonymous">
<style>

.mb-0 > a {
  display: inline-block;
  width: 100%;
  padding:0.75rem 1.25rem;
}
.card-header {
  padding:0;
}

</style>
<div id="accordion" role="tablist" aria-multiselectable="true">
  <div class="card">
    <div class="card-header" role="tab" id="headingOne">
      <h5 class="mb-0">
        <a data-toggle="collapse" data-parent="#accordion" href="#collapseOne" aria-expanded="true" aria-controls="collapseOne">
          Collapsible Group Item #1
        </a>
      </h5>
    </div>

    <div id="collapseOne" class="collapse in" role="tabpanel" aria-labelledby="headingOne">
      <div class="card-block">
        Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid.
      </div>
    </div>
  </div>
  <div class="card">
    <div class="card-header" role="tab" id="headingTwo">
      <h5 class="mb-0">
        <a class="collapsed" data-toggle="collapse" data-parent="#accordion" href="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo">
          Collapsible Group Item #2
        </a>
      </h5>
    </div>
    <div id="collapseTwo" class="collapse" role="tabpanel" aria-labelledby="headingTwo">
      <div class="card-block">
        Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid.
      </div>
    </div>
  </div>
</div>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script> 
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.5/js/bootstrap.min.js" integrity="sha384-BLiI7JTZm+JWlgKa0M0kGRpJbF2J8q+qreVrKBC47e3K6BW78kGLrCkeRX6I9RoK" crossorigin="anonymous"></script>


Just use data-target on the header divs..

<div class="card-header" role="tab" id="headingOne" data-toggle="collapse" data-parent="#accordion" data-target="#collapseOne">
     <h5 class="mb-0">
        <a href>
           Collapsible Group Item #1
        </a>
     </h5>
</div>

http://www.codeply.com/go/f6LLnOaKHu


Just change anchor order, I haven't found another easy solution.

Take note that v4 of bootstrap at this moment is in alpha release and at this moment is giving some strange script error.

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.5/css/bootstrap.min.css" rel="stylesheet"/>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.5/js/bootstrap.min.js"></script>



<div id="accordion" role="tablist" aria-multiselectable="true">
  <div class="card">
  <a data-toggle="collapse" data-parent="#accordion" href="#collapseOne" aria-expanded="true" aria-controls="collapseOne">
    <div class="card-header" role="tab" id="headingOne" >
      <h5 class="mb-0">
        
          Collapsible Group Item #1
        
      </h5>
    </div>
</a>
    <div id="collapseOne" class="collapse in" role="tabpanel" aria-labelledby="headingOne">
      <div class="card-block">
        Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid.
      </div>
    </div>
  </div>
  <div class="card">
      <a class="collapsed" data-toggle="collapse" data-parent="#accordion" href="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo">
    <div class="card-header" role="tab" id="headingTwo" data-toggle="collapse" data-parent="#accordion">
      <h5 class="mb-0">
    
          Collapsible Group Item #2
        
      </h5>
    </div>
    </a>
    <div id="collapseTwo" class="collapse" role="tabpanel" aria-labelledby="headingTwo">
      <div class="card-block">
        Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid.
      </div>
    </div>
  </div>
</div>

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Bootstrap 4

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