<div class="sample48"></div>

.sample48{
width:100px;
height:100px;
margin:0 auto;/*中央寄せ*/
border-radius:50%;/*角を丸めて円に*/
border:solid 2px #fc0;/*黄色い円*/
background-image:
repeating-linear-gradient(0deg,transparent,transparent 24px,#fc0 24px,#fc0 26px,transparent 26px,transparent 50px),/*水平線*/
repeating-linear-gradient(120deg,transparent,transparent 42.3px,#fc0 42.3px,#fc0 44.3px,transparent 44.3px,transparent 50px),/*右上がり斜線*/
repeating-linear-gradient(-120deg,transparent,transparent 42.3px,#fc0 42.3px,#fc0 44.3px,transparent 44.3px,transparent 50px);/*左上がり斜線*/
}

<center><a href="URL" class="sample48A">リンク文字</a></center>

.sample48A{
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*/
border:solid 2px #fc0;/*黄色い円*/
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: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-image:
repeating-linear-gradient(0deg,transparent,transparent 24px,#fc0 24px,#fc0 26px,transparent 26px,transparent 50px),/*水平線*/
repeating-linear-gradient(120deg,transparent,transparent 42.3px,#fc0 42.3px,#fc0 44.3px,transparent 44.3px,transparent 50px),/*右上がり斜線*/
repeating-linear-gradient(-120deg,transparent,transparent 42.3px,#fc0 42.3px,#fc0 44.3px,transparent 44.3px,transparent 50px);/*左上がり斜線*/
}