.loader {
    width: 48px;
    height: 48px;
    border: 4px solid #e0e0e0;
    border-top: 4px solid #0078D7;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 50px auto;
}

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

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