.loader {
    position: fixed;
    border: 16px solid #f3f3f3;
    border-radius: 50%;
    border-top: 16px solid #3a5170;
    width: 150px;
    height: 150px;
    top: 40%;
    right: 48%;
    z-index: 11;
    -webkit-animation: spin 1.5s linear infinite;
    animation: spin 1.5s linear infinite;
}

.loader-background {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 10;
    background-color: black;
    opacity: .6;
}

@-webkit-keyframes spin {
    0% {
        -webkit-transform: rotate(0deg);
    }

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

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

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