#progress {
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    position: fixed;
    background-color: rgba(0,0,0,.8);
    display: none;
}

#progress #body {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
}

#progress #body img {
    width: 100px;
}

.pulse {
    animation: pulse 0.5s infinite;
    animation-direction: alternate;
    -webkit-animation-name: pulse;
    animation-name: pulse;
}

@-webkit-keyframes pulse {
    0% {
        -webkit-transform: scale(1);
    }
    100% {
        -webkit-transform: scale(1.1);
    }
}