body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f8f9fa;
}

.card-header {
    background-color: #007bff;
    color: white;
}

.btn-primary {
    background-color: #007bff;
    border-color: #007bff;
}

.btn-primary:hover {
    background-color: #0056b3;
    border-color: #0056b3;
}

.progress-bar {
    background-color: #007bff;
}

.list-group-item.active {
    background-color: #007bff;
    border-color: #007bff;
}

#certificate {
    border: 5px solid #007bff;
    padding: 20px;
    text-align: center;
}