body {
    font-family: 'Arial', sans-serif;
    background-color: #f4f7f6;
}

.navbar {
    margin-bottom: 20px;
}

.card-header {
    font-weight: bold;
}

.jumbotron {
    background-color: #e9ecef; /* A light grey, adjust as needed */
    padding: 2rem 2rem;
}

.alert {
    margin-top: 1rem;
}

/* Add more custom styles as needed */

.loader {
    border: 5px solid #f3f3f3; /* Light grey */
    border-top: 5px solid #3498db; /* Blue */
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
    display: none; /* Hidden by default */
}

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