body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #f0f0f0;
    margin: 0;
    padding: 20px;
    box-sizing: border-box;
}

.container {
    background-color: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    text-align: center;
    max-width: 600px;
    width: 90%;
}

.youtube-placeholder {
    background-color: #f1f1f1;
    border: 2px dashed #ccc;
    height: 200px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 20px;
}

.youtube-placeholder p {
    color: #888;
    font-style: italic;
}

h1 {
    margin-bottom: 10px;
    color: #333;
}

h2 {
    margin-bottom: 20px;
    color: #666;
}

.chord-notation {
    font-size: 1.5em;
    line-height: 1.6;
}

.breath-mark {
    display: inline-block;
    width: 1em;  
    height: 1em; 
    border-radius: 50%;
    background-color: #3498db;
    color: white;
    text-align: center;
    line-height: 1em; 
    margin: 0 0.2em;
    font-size: 0.8em;
    vertical-align: middle; 
}

.breath-mark[data-breath="long"] {
    width: 1.2em;
    height: 1.2em;
    background-color: #2980b9;
}

.song-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.song-item {
    background-color: #f1f1f1;
    padding: 15px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.song-item:hover {
    background-color: #e1e1e1;
}

.back-button {
    display: inline-block;
    margin-top: 20px;
    padding: 10px 15px;
    background-color: #3498db;
    color: white;
    text-decoration: none;
    border-radius: 5px;
}