body {
    font-family: 'Segoe UI', Arial, sans-serif;
}

.center {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-weight: bold;
    text-align: center;
}

div.ic64, span.ic64 {
    font-size: 64px;
    height: 64px;
    line-height: 64px;
    width: 64px;
    margin-top: 2px;
    margin-bottom: -2px;
    animation: rotation 2s infinite linear;
    display: inline-block;
}

@keyframes rotation {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(359deg);
    }
}