.loading-background {
    position: fixed;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    background-color: rgba(0,0,0,0.5);
    z-index: 1100;
}

.loading-content {
    width: 300px;
    position: fixed;
    top: 50%;
    left: 50%;
    margin-top: -100px;
    margin-left: -150px;
    background-color: #ffffff;
    border-radius: 5px;
    text-align: center;
    z-index: 1101; /* 1px higher than the overlay layer */
}