Edit in JSFiddle

<div id="circle1">
원 만들기
</div>
<br>
<div id="circle2">
원 만들기2
</div>

#circle1 {
background-color:#86efef;
width:150px;
height:150px;
border-radius:75px;
text-align:center;
margin:0 auto;
font-size:12px;
vertical-align:middle;
line-height:150px;
}
#circle2 {
background-color:#0009;
border:1px solid #ff0000;
width:100px; height:100px;
border-radius:75px;
text-align:center;
margin:0 auto;
font-size:12px; color:#fff;
vertical-align:middle;
line-height:100px;
}