.dark-background {
    position: fixed;
    width: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    height: 102%;
    top: 0;
    z-index: 5000;
    left: 0;
}

.modal-dialog.loading {
    display: block;
    position: absolute;
    width: 30%;
    left: 35%;
    top: 25%;
}

.modal-dialog.loading span.loader {
    width: 32px;
    height: 32px;
    border: 5px solid #000;
    border-bottom-color: transparent;
    border-radius: 50%;
    display: inline-block;
    box-sizing: border-box;
    animation: rotation 1s linear infinite;
    margin-right: 6px;
    vertical-align: middle;
}

@keyframes rotation {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}