Collapsible Timeline using Bootstrap's .panel.

HTML

<script src="//code.jquery.com/jquery-1.11.0.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
<div class="container">
    <!-- Page header -->
    <!-- /Page header -->
    <!-- Timeline -->
    <div class="timeline">
        <div class="line"></div>
        <div class="panel-group" id="accordion" role="tablist" aria-multiselectable="true">
            <div class="panel panel-default">
                <div class="panel-heading" role="tab" id="heading1">
                    <div class=" icon"> <i class="glyphicon glyphicon-one-fine-dot"></i>

                    </div>
                     <h4 class="panel-title">
        <a role="button" data-toggle="collapse" data-parent="#accordion" href="#collapse1" aria-expanded="true" aria-controls="collapse1">
          1891
        </a>
      </h4>

                </div>
                <div id="collapse1" class="panel-collapse collapse in" role="tabpanel" aria-labelledby="heading1">
                    <div class="panel-body">
                        <div class="photoholder">
                            <img src="http://placehold.it/200x300" />
                        </div>
                        <p>Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.</p>
                    </div>
                </div>
           ...

CSS

@import url(http://fonts.googleapis.com/css?family=Oswald);
body, html {
  background:black;
  color:white;
  
}
 .photoholder {
    position:absolute;
    right:0;
    display:none;
}
.collapse.in .photoholder {
    float:right;
    width:30%;
    padding:0px 10px;
    display:block;
}
.panel {
    width:100%;
}
.panel-collapse {
    width:70%;
}
.photoholder img {
    width:100%;
    height:auto;
}
.glyphicon.glyphicon-one-fine-dot:before {
    content:"\25cf";
    font-size: 1.5em;
    color:#FFF;
}
.timeline {
    position:relative;
    width:100%;
    float:left;
    position: relative;
    padding:0 0 60px 0;
    margin-top:0;
    margin-top: 4px;
}
.timeline .line {
    position: absolute;
    width: 2px;
    display: block;
    top: 32px;
    bottom: 0px;
    margin-left: 30px;
    background: #FFF;
}
.timeline .separator {
    border-top: 1px solid #000000;
    padding: 5px;
    padding-left: 40px;
    font-style: italic;
    font-size: .9em;
    margin-left: 30px;
}
.timeline .line::before {
    top: -2px;
}
.timeline .line::after {
    bottom: -2px;
}
.timeline .line::before, .timeline .line::after {
    content:'';
    position: absolute;
    left: -6px;
    width: 0;
    height: 0;
    display: block;
    border-radius: 50%;
    background: #000000;
}
.timeline .panel {
    position: relative;
    margin: 10px 0px 0px 40px;
    clear: both;
    margin: 0 auto;
    padding: 10px 0px 0 40px;
    background:none;
}
.timeline .panel::before {
    position: absolute;
    display: block;
    top: 8px;
    left: -24px;
    content:'';
    width: 0px;
    height: 0px;
    border: inherit;
    border-width: 12px;
    border-top-color: transparent;
    border-bottom-color: transparent;
    border-left-color: transparent;
}
.timeline .panel .panel-heading.icon * {
    font-size: 14px;
    vertical-align: middle;
    line-height: 40px;
}
.timeline .panel > .panel-heading .icon {
    position: absolute;
    left: 11px;
    /*display: block;*/
    width: 40px;
   ...