<a href="#" class="link">Border Link</a>
.link{
text-decoration: none;
color: inherit;
background: white;
border: 1px solid red;
padding:15px 25px;
transition: 0.15s ease-in-out;
box-shadow: 0 1rem 3rem rgba(0,0,0,.175)!important;
}
.link:hover{
background:red;
color: white;
}