<ol class="cp_clist">
<li>css</li>
<li>html</li>
<li>copy</li>
<li>easy</li>
</ol>
ol.cp_clist {
padding: 0;
counter-reset:cp_clist; /*数字をリセット*/
list-style-type: none;
}
ol.cp_clist li {
position: relative;
margin: 0 0 0 30px;
}
ol.cp_clist li::before {
position: absolute;
display: flex;
justify-content: center;
align-items: center;
/* カウントさせる */
counter-increment: cp_clist;
content: counter(cp_clist);
/*装飾*/
background: #F4511E;
color: #fff;
width: 20px;
height: 20px;
border-radius: 50%;
/*位置の調整*/
margin-top: 2px;
margin-left: -30px;
}