body {
    animation: fadeIn .8s;
}
.spinner {
    margin: 40px auto;
    width: 48px;
    height: 48px;
    border: 4px solid #ccc;
    border-top-color: #333;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}