.spinner {
    border: 16px solid silver;
    border-top: 16px solid #337AB7;
    border-radius: 50%;
    width: 80px;
    height: 80px;
    animation: spin 700ms linear infinite;
    top: 40%;
    left: 55%;
    position: absolute;
    z-index: 99;
}

.spinner-sm {
    margin-left: 5px;
    border: 2px solid silver;
    border-radius: 50%;
    border-top: 2px solid #337AB7;
    width: 20px;
    height: 20px;
    -webkit-animation: spin 2s linear infinite; /* Safari */
    animation: spin 1s linear infinite;
}

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

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

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

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