<style>
    .panel-title {
        position: relative;
    }

    .panel-title::after {
        content: "\f107";
        color: #333;
        top: -2px;
        right: 0px;
        position: absolute;
        font-family: "FontAwesome"
    }

    .panel-title[aria-expanded="true"]::after {
        content: "\f106";
    }

    .panel {
        border-bottom: solid 1px;
    }

</style>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet"/>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" rel="stylesheet"/>

<div class="panel-group" id="accordion">
    <!-- First Panel -->
    <div class="panel panel-default bg-transparent">
        <div class="panel-heading">
            <h4 class="panel-title" data-toggle="collapse" data-target="#collapseOne">
                Collapsible Group Item #1
            </h4>
        </div>
        <div id="collapseOne" class="panel-collapse collapse">
            <div class="panel-body">
                Anim pariatur cliche reprehenderit,
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            </div>
        </div>
    </div>

    <!-- Second Panel -->
    <div class="panel panel-default">
        <div class="panel-heading">
            <h4 class="panel-title" data-toggle="collapse" data-target="#collapseTwo">
                Collapsible Group Item #2
            </h4>
        </div>
        <div id="collapseTwo" class="panel-collapse collapse">
            <div class="panel-body">
                Anim pariatur cliche reprehenderit,
                enim eiusmod high life accusamus terry richardson ad squid.
            </div>
        </div>
    </div>

    <!-- Third Panel -->
    <div class="panel panel-default">
        <div class="panel-heading">
            <h4 class="panel-title" data-toggle="collapse" data-target="#collapseThree">
                Collapsible Group Item #3
            </h4>
        </div>
        <div id="collapseThree" class="panel-collapse collapse">
            <div class="panel-body">
                Anim pariatur cliche reprehenderit,
                enim eiusmod high life accusamus terry richardson ad squid.
            </div>
        </div>
    </div>
</div>