* {
    margin: 0;
    padding: 0;
}

html,
body {
    height: 100%;
}

.url-wrapper {
    margin: auto;
    width: 200px;
    height: 50px;
    border: 1px solid rgba(204,204,204,0.5);
}
.url-wrapper a {
    text-decoration: none;
    display: block;
    width: 100%;
    height: 100%;
    text-align: center;
    line-height: 50px;
    color: #fff;
}