<div class="sample49"></div>

.sample49{
width:104px;
height:104px;
margin:0 auto;/*中央寄せ*/
border-radius:50%;/*角を丸めて円に*/
background-image:
repeating-linear-gradient(90deg,transparent,transparent 6px,#fc0 6px,#fc0 8px,transparent 8px,transparent 90px),
repeating-linear-gradient(30deg,transparent,transparent 25px,#fc0 25px,#fc0 27px,transparent 27px,transparent 90px),
repeating-linear-gradient(-30deg,transparent,transparent 25px,#fc0 25px,#fc0 27px,transparent 27px,transparent 90px),
repeating-linear-gradient(0deg,transparent,transparent 25px,#fc0 25px,#fc0 27px,transparent 27px,transparent 52px),
repeating-linear-gradient(120deg,transparent,transparent 44px,#fc0 44px,#fc0 46px,transparent 46px,transparent 52px),
repeating-linear-gradient(-120deg,transparent,transparent 44px,#fc0 44px,#fc0 46px,transparent 46px,transparent 52px);
}

<center><a href="URL" class="sample49A">リンク文字</a></center>

.sample49A{
display:inline-block;/*a要素に幅と高さを指定する時に必要*/
width:104px;
height:104px;
color:#666;/*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:104px;/*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)*/
border-radius:50%;/*角を丸めて円に*/
background-image:
repeating-linear-gradient(90deg,transparent,transparent 6px,#fc0 6px,#fc0 8px,transparent 8px,transparent 90px),
repeating-linear-gradient(30deg,transparent,transparent 25px,#fc0 25px,#fc0 27px,transparent 27px,transparent 90px),
repeating-linear-gradient(-30deg,transparent,transparent 25px,#fc0 25px,#fc0 27px,transparent 27px,transparent 90px),
repeating-linear-gradient(0deg,transparent,transparent 25px,#fc0 25px,#fc0 27px,transparent 27px,transparent 52px),
repeating-linear-gradient(120deg,transparent,transparent 44px,#fc0 44px,#fc0 46px,transparent 46px,transparent 52px),
repeating-linear-gradient(-120deg,transparent,transparent 44px,#fc0 44px,#fc0 46px,transparent 46px,transparent 52px);
}