.loader {
    border: 16px solid #f3f3f3; /* Light grey */
    border-top: 16px solid #4298db; /* Blue */
    border-radius: 50%;
    margin-left: 40%;
    margin-top: 20px;
    margin-bottom: 20px;
    left: 50%;
    width: 90px;
    height: 90px;
    animation: spin 1s linear infinite;
}

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

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