.loader-container {
    width: 100%;
    position: fixed;
    background: lightgray;
    height: 100%;
    top: 0;
    left: 0;
    opacity: 0.90;
    z-index: 100000;
}

.loader-container .spinner-border {
    top: calc(50vh - 100px);
    left: calc(50vw - 100px);
    width: 200px;
    height: 200px;
    color: white;
    position: fixed;
}