canvas {
    width: 100%;
    height: 100%;
    background: #222
}

.centered-box {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 10px;
    background: rgb(230, 230, 230); /* IE */
    background: rgba(255, 255, 255, 0.60); /* NON-IE */
    border-radius: 10px;
    color: #222;
    animation: pulse 120s;
    animation-iteration-count: 1
}

@keyframes pulse {
    0% {
        opacity: 1
    }

    10% {
        opacity: 0
    }

    100% {
        opacity: 0
    }
}


.fadeIn {
    opacity: 0;
    animation: 2s slidefade 1s forwards
}