body {
    text-align: center;
    font-family: 'Fira Sans', sans-serif;
    line-height: 1.5em;
}

a {
    color: #0D488D;
}

.centered {
    position: fixed;
    top: 50%;
    left: 50%;
    /* bring your own prefixes */
    transform: translate(-50%, -50%);
}