.loading {
    position: fixed;
    top:0;
    height: 100vh;
    width: 100%;
    background-color: rgba(0, 0, 0, 0.15);
    z-index: 1400;
}
.spinner-border {
    z-index: 1500;
    position: relative;
    width: 100px;
    height: 100px;
    top: 45%;
    left: 45%;
}