.loading {
    text-align: center;
    padding: 180px 20px;
    color: #666;
    font-size: 16px;
    margin: 20px;
}
.loading:before {
    content: "";
    display: block;
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    border: 9px solid #f3f3f3;
    border-top: 9px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}
@media (max-width: 768px) {
    .loading, .error {
        margin: 10px;
        padding: 80px 15px;
    }    
    .loading:before {
        width: 30px;
        height: 30px;
		border: 3px solid #f3f3f3;
        border-top: 3px solid #3498db;
    }
}