<ol class="cp_clist">
<li>css</li>
<li>html</li>
<li>copy</li>
<li>easy</li>
</ol>
ol.cp_clist {
counter-reset:cp_clist; /*数字をリセット*/
list-style-type: none;
padding:0.5em;
}
ol.cp_clist li {
position: relative;
padding-left: 30px;
padding: 0.5em 0.5em 0.5em 30px;
}
ol.cp_clist li::before {
position: absolute;
display:inline-block;
top: 50%;
left: 0;
/* カウントさせる */
counter-increment: cp_clist;
content: counter(cp_clist);
/*装飾*/
padding: 0 0.2em 0 0.2em;
background: #F4511E;
color: #fff;
font-weight:bold;
border-radius: 50%;
width: 25px;
height: 25px;
line-height: 25px;
text-align:center;
transform: translateY(-50%);
}