timeline.css

.timeline {
	position: relative;
	padding: 21px 0px 10px;
	margin-top: 4px;
	margin-bottom: 30px;
}

.timeline .line {
	position: absolute;
	width: 4px;
	display: block;
	background: currentColor;
	top: 0px;
	bottom: 0px;
	margin-left: 30px;
}

.timeline .separator {
	border-top: 1px solid currentColor;
	padding: 5px;
	padding-left: 40px;
	font-style: italic;
	font-size: .9em;
	margin-left: 30px;
}

.timeline .line::before { top: -4px; }
.timeline .line::after { bottom: -4px; }
.timeline .line::before,
.timeline .line::after {
	content: '';
	position: absolute;
	left: -4px;
	width: 12px;
	height: 12px;
	display: block;
	border-radius: 50%;
	background: currentColor;
}

.timeline .panel {
	position: relative;
	margin: 10px 0px 21px 70px;
	clear: both;
}

.timeline .panel .panel-heading.icon * { font-size: 20px; vertical-align: middle; line-height: 40px; }
.timeline .panel .panel-heading.icon {
	position: absolute;
	left: -59px;
	display: block;
	width: 40px;
	height: 40px;
	padding: 0px;
	border-radius: 50%;
	text-align: center;
	float: left;
}

.timeline .panel-outline {
	border-color: transparent;
	background: transparent;
	box-shadow: none;
}

.timeline .panel-outline .panel-body {
	padding: 10px 0px;
}

.timeline .panel-outline .panel-heading:not(.icon),
.timeline .panel-outline .panel-footer {
	display: none;
}

.timeline .panel-pipe-in {
	margin-left: 129px;
}

.timeline .panel-pipe {
	position: absolute;
	left: -100px;
	z-index: -5;
	border-bottom-left-radius: 100%;
	width: 100px;
	height: 100px;
	border-left: 4px solid currentColor;
	border-bottom: 4px solid currentColor;
}