<a class="btn btn-6">Hover 6</a>

*{
 box-sizing: inherit;
 transition-property: all;
 transition-duration: .3s;
 transition-timing-function: ease;
}

a {
 text-decoration: none;
}

.btn {
 color: #fff;
 cursor: pointer;
 display: block;
 font-size: 16px;
 font-weight: 400;
 line-height: 45px;
 margin: 10px;
 max-width: 150px;
 width: 100%;
 height: 45px;
 text-align: center;
 position: relative;
 text-transform: uppercase;
}

.btn-6 {
 border: 0 solid;
 outline: 1px solid;
 outline-color: rgba(255, 255, 255, 0.5);
 text-shadow: none;
 transition: all 210ms ease-in-out;
}

.btn-6:hover {
 border: 1px solid;
 outline-color: rgba(255, 255, 255, 0);
 text-shadow: 1px 1px 2px #427388;
}