.loader {
    border: 16px solid #a6a6a6; /* Light grey #f3f3f3;*/
    border-top: 16px solid #074b88; /* Blue  #3498db;*/
    border-radius: 50%;
    width: 20px;
    height: 20px;
    animation: spin 2s linear infinite;
}

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