Template:Pin/style.css

.pin {
   font-weight: bold;
   border-width: 1px;
   border-style: solid;
   border-radius: 100%;
   /* This vertical centering is not consistent across all fonts. Need better solution. */
   display: inline-block;
   text-align: center;
   width: 1.25em;
   height: 1.25em;
   line-height: 1em;
}