*
{

    margin: 0;
    box-sizing: border-box;
}
body {
    padding: 15px;
    font-family: sans-serif;
    background-color: rgb(0, 81, 152);
    color: white;
}

hr {
    border: solid 3px white;
}

header , footer {
    text-align: center;
}

#musicSettings {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}
#musicSettings select {
    font-size: 1rem;
}
#musicBox {
    border: solid 3px white;
    border-radius: 15px;
    
    padding: 15px;
    background-color: rgb(0, 48, 0);
}

#twelveBox {
    border: solid 3px white;
    border-radius: 15px;
    
    padding: 15px;
    background-color: rgb(81, 28, 5);
    
}

.notesCategory {
    margin: 6px 0;
    font-weight: 700;
}

.notesHint {
    margin-top: 8px;
    font-size: 0.9rem;
}

#sevenNotes,
#fiveNotes {
    border: solid 3px white;
    border-radius: 15px;
    
    padding: 5px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
}

#fiveNotes {
    margin-top: 8px;
}

.sevenNotesNote,
.fiveNotesNote {
    border: solid 3px white;
    border-radius: 15px;
    height: 100%;
    aspect-ratio: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 3rem;
    user-select: none;
    touch-action: none;
    cursor: pointer;
    transition: 0.1s;
}

.sevenNotesNote:hover,
.fiveNotesNote:hover {
    border: solid 6px black;
    font-weight: bold;
}

.sevenNotesNote:nth-child(1) { background: #ff0000; }
.sevenNotesNote:nth-child(2) { background: #ff7f00; }
.sevenNotesNote:nth-child(3) { background: #b1b10f; }
.sevenNotesNote:nth-child(4) { background: #00ff00; }
.sevenNotesNote:nth-child(5) { background: #0000ff; color: #fff; }
.sevenNotesNote:nth-child(6) { background: #4b0082; color: #fff; }
.sevenNotesNote:nth-child(7) { background: #8b00ff; color: #fff; }

.fiveNotesNote {
    color: #fff;
}

.fiveNotesNote:nth-child(1) { background: #990000; } /* C# from C */
.fiveNotesNote:nth-child(2) { background: #994c00; } /* D# from D */
.fiveNotesNote:nth-child(3) { background: #009900; } /* F# from F */
.fiveNotesNote:nth-child(4) { background: #000099; } /* G# from G */
.fiveNotesNote:nth-child(5) { background: #2f0050; } /* A# from A */