.border {
    position: relative;
    display:inline-block;
    text-decoration: none;
    padding:10px 20px;
    color:#444;
    margin:40px;
}
.border::after {
    content:"";
    position: absolute;
    width:220%;
    border:1px solid currentColor;
    height:220%;
    top:50%;
    left:50%;
    transform:translate(-50%, -50%) scale(.5);
}