/**
 * Source: https://www.w3schools.com/howto/howto_css_loader.asp
 */

.loader
{
    border: 16px solid #f3f3f3; /* Light grey */
    border-top: 16px solid #5D68BB;
    border-radius: 50%;
    width: 120px;
    height: 120px;
    animation: spin 1s linear infinite;
    margin-top: 10em;
}

@keyframes spin
{
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}