.center {
    position: absolute;
    width: 600px;
    height: 50px;
    top: 40%;
    left: 50%;
    margin-left: -300px; /* margin is -0.5 * dimension */
    margin-top: -50px;
    text-align: center;
    font-size: 3rem;
    font-family: 'Segoe UI Light';
}

body {
    background-color: #ecf0f5;
    color: #2b2b2a;
}​