#js-viewer {
    position: fixed;
    top: 0px;
    left: 0px;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.612);
    display: flex;
    flex-flow: column;
    justify-content: center;
    align-items: center;
}

#js-viewer img {
    max-width: 95%;
    max-height: 80%;
    height: auto;
    width: auto;
    border: 3px ridge #c3c3c3;
}

#js-viewer span {
    margin-top: 10px;
}

#js-viewer span button {
    border-radius: 0px;
    border: 2px outset #cecece;
    background-color: #e2e2e2;
    cursor: pointer;
}

#js-viewer span button:hover {
    border: 2px inset #cecece;
    background-color: #b8b8b8;
}