.loader { 
    border: 4px solid #f3f3f3; 
    border-radius: 50%; 
    border-top: 4px solid #005a9c; 
    width: 24px; 
    height: 24px; 
    animation: spin 2s linear infinite; 
}
@keyframes spin { 
    0% { transform: rotate(0deg); } 
    100% { transform: rotate(360deg); } 
}