#viewer-content {
    height: calc(100vh - 81px);
    width: 100%;
    overflow: hidden;
    position: relative;
}

.viewer-loading {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: rgba(255, 255, 255, 0.9);
    z-index: 10;
}

.loading-gif {
    height: 75px;
}

.viewer-dl-icon {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    background-color: whitesmoke;
    border-radius: 5px;
    padding: 5px;
    cursor: pointer;
}
.viewer-dl-icon:hover {
    background-color: lightgray;
}