body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #1e1e1e;
    color: #e0e0e0;
}

h1 {
    text-align: center;
}

form {
    max-width: 500px;
    margin: 0 auto;
    padding: 20px;
    background-color: #2e2e2e;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.5);
}

label {
    display: block;
    margin: 10px 0 5px;
}

textarea, select, button {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
    border-radius: 4px;
    border: 1px solid #555;
    background-color: #3e3e3e;
    color: #e0e0e0;
}

#music-sheet {
    margin-top: 30px;
    text-align: center;
}

.music-sheet {
    display: block;
    padding-bottom: 75%;
}

.spinner {
    border: 8px solid #f3f3f3;
    border-top: 8px solid #3498db;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 2s linear infinite;
    margin: 0 auto;
}

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