.loader {
    border: 5px solid #f3f3f3; /* Light grey */
    border-top: 5px solid #04AA6A; /* Green */
    border-radius: 50%;
    width: 30px;
    height: 30px;
    animation: spin 2s linear infinite;
    margin: auto;
}

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