<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 li {
	position: relative;
	line-height: 28px;
	margin: 10px 0;
	padding-left: 40px;
	transition: 0.3s;
}
ol.cp_clist li:nth-child(4n+1){
	border: 1px dotted #f1c6c6;
}
ol.cp_clist li:nth-child(4n+2){
	border: 1px dotted #8cd9bc;
}
ol.cp_clist li:nth-child(4n+3){
	border: 1px dotted #9575CD;
}
ol.cp_clist li:nth-child(4n+4){
	border: 1px dotted #f8e5ab;
}
ol.cp_clist li:before {
	position: absolute;
	top: 50%;
	left: -1px;
	counter-increment: cp_clist;
	content: counter(cp_clist);
	padding: 0 0.2em 0 0.2em;
	font-weight: bold;
	color: #fff;
	text-align: center;
	line-height: 30px;
	width: 30px;
	height: 30px;
	transform: translateY(-50%);
}
ol.cp_clist li:nth-child(4n+1):before{
	background: #F06292;
}
ol.cp_clist li:nth-child(4n+2):before{
	background: #4DB6AC;
}
ol.cp_clist li:nth-child(4n+3):before{
	background: #9575CD;
}
ol.cp_clist li:nth-child(4n+4):before{
	background: #FFB74D;
}
ol.cp_clist li:hover {
	color:#fff;
	overflow: hidden;
	z-index: 1;
}
ol.cp_clist li:nth-child(4n+1):hover{
	background: #F06292;
}
ol.cp_clist li:nth-child(4n+1):hover:before{
	background: #fff;
	color: #F06292;
}
ol.cp_clist li:nth-child(4n+2):hover{
	background: #4DB6AC;
}
ol.cp_clist li:nth-child(4n+2):hover:before{
	background: #fff;
	color: #4DB6AC;
}
ol.cp_clist li:nth-child(4n+3):hover{
	background: #9575CD;
}
ol.cp_clist li:nth-child(4n+3):hover:before{
	background: #fff;
	color: #9575CD;
}
ol.cp_clist li:nth-child(4n+4):hover{
	background: #FFB74D;
}
ol.cp_clist li:nth-child(4n+4):hover:before{
	background: #fff;
	color: #FFB74D;
}