<div class="sample52"></div>

.sample52{
width:100px;
height:100px;
border-radius:50%;/*角を丸めて円に*/
margin:0 auto;/*中央寄せ*/
background-color:#096;/*背景色*/
background-image:
linear-gradient(-60deg,rgba(255,255,255,0.3) 37.5px,transparent 37.5px),
linear-gradient(60deg,rgba(255,255,255,0.3) 37.5px,transparent 37.5px),
linear-gradient(-120deg,rgba(255,255,255,0.3) 37.5px,transparent 37.5px),
linear-gradient(120deg,rgba(255,255,255,0.3) 37.5px,transparent 37.5px);
background-position:50px 75px,50px 75px,50px 25px,50px 25px;
}

<center><a href="URL" class="sample45A">リンク文字</a></center>

.sample45A{
display:inline-block;/*a要素に幅と高さを指定する時に必要*/
width:100px;
height:100px;
border-radius:50%;/*角を丸めて円に*/
color:#fff;/*リンク文字の色*/
font-weight:bold;/*リンク文字を太字に*/
text-decoration:none;/*リンク文字の下線を消す*/
line-height:100px;/*リンク文字を中央に(縦方向)*/
text-align:center;/*リンク文字を中央に(横方向)*/
background-color:#096;/*背景色*/
background-image:
linear-gradient(-60deg,rgba(255,255,255,0.3) 37.5px,transparent 37.5px),
linear-gradient(60deg,rgba(255,255,255,0.3) 37.5px,transparent 37.5px),
linear-gradient(-120deg,rgba(255,255,255,0.3) 37.5px,transparent 37.5px),
linear-gradient(120deg,rgba(255,255,255,0.3) 37.5px,transparent 37.5px);
background-position:50px 75px,50px 75px,50px 25px,50px 25px;
}