.hidden { display: none !important; }
.loader {
    border: 2px solid #f3f3f3; /* Light grey */
    border-top: 2px solid #3498db; /* Blue */
    border-radius: 50%;
    width: 10px;
    height: 10px;
    margin-left: 4px;
    animation: spin 2s linear infinite;
    display: inline-block;
}
.submit1 {
    padding: 8px;
    margin: 4px;
}

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