.submit-progress {
    position: fixed;
    top: 45%;
    left: 50%;
    height: 6em;
    padding-top: 2.3em;
    z-index: 1031;
    /* The following rules are the
     ones most likely to change */
    width: 23em;
    /* Set 'margin-left' to a negative number
     that is 1/2 of 'width' */
    margin-left: -1em;
    padding-left: 2.1em;
    opacity: 1;
    justify-content: center;
    align-items: center;
}

.submit-progress-bg {
    background-color: lightgray;
    opacity: .5;
}

img.animated-gif {
    width: 40px;
    height: 40px;
}