<ol class="cp_clist">
	<li>css</li>
	<li>html</li>
	<li>copy</li>
	<li>easy</li>
</ol>

ol.cp_clist {
	counter-reset: cp_clist;
	list-style: none;
	padding: 0.5em;
}
ol.cp_clist ol {
	margin: 0 0 0 35px;
	padding: 0em;
}
.cp_clist li {
	position: relative;
	display: block;
	text-decoration: none;
	padding: 3px 3px 3px 8px;
	margin: 8px 0 8px 30px;
	background: #FFAB91;
	color: #333;
	transition: all .3s ease-out;
}
.cp_clist li:hover {
	background: #FFCCBC;
}
.cp_clist li::before {
	position: absolute;
	top: 50%;
	left: -35px;
	counter-increment: cp_clist;
	content: counter(cp_clist);
	padding: 0 0.2em 0 0.2em;
	margin-top: -1em;
	height: 28px;
	width: 28px;
	font-weight: bold;
	color: #fff;
	background: #FF5722;
	line-height: 28px;
	text-align: center;
}
.cp_clist li::after {
	content: '';
	position: absolute;
	top: 50%;
	left: -28px;
	margin-top: -6px;
	border: 6px solid transparent;
	transition: all .3s ease-out;
}
.cp_clist li:hover::after {
	left: -6px;
	border-left-color: #FF5722;
}