body {
    background-color: #f4f6f9;
}

.card {
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    border: none;
}

.btn-primary, .btn-success {
    background-color: #2c3e50;
    border-color: #2c3e50;
}

.btn-primary:hover, .btn-success:hover {
    background-color: #34495e;
    border-color: #34495e;
}

#audioResult {
    background-color: #e9ecef;
    padding: 20px;
    border-radius: 5px;
    margin-top: 20px;
}

audio {
    width: 100%;
    margin-bottom: 15px;
}

/* Add some responsiveness */
@media (max-width: 576px) {
    .container {
        padding-left: 10px;
        padding-right: 10px;
    }
}