console
<div><a href="javascript:void(0)" class="btn">Hover me</a></div>
* {
padding: 0;
margin: 0;
}
body {
font: 14px/1.5 Arial;
box-sizing: border-box;
}
.btn {
display: block;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
text-transform: uppercase;
width: 200px;
height: 40px;
text-decoration: none;
color: #fff;
text-align: center;
line-height: 40px;
border: 1px solid #d91222;
-moz-box-shadow: 200px 0 #d91222 inset;
box-shadow: 200px 0 #d91222 inset;
-webkit-transition: all 0.3s;
-moz-transition: all 0.3s;
-o-transition: all 0.3s;
transition: all 0.3s;
}
.btn:hover {
box-shadow: 0 0 #d91222 inset;
color: #d91222;
}