body {
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 0;
    padding: 0;
}

#board {
    display: grid;
    grid-template-columns: repeat(8, 27px); /* サイズを35pxから27pxに縮小 */
    grid-template-rows: repeat(12, 27px); /* サイズを35pxから27pxに縮小 */
    gap: 1px;
    margin-top: 20px;
}

.cell {
    width: 27px; /* サイズを35pxから27pxに縮小 */
    height: 27px; /* サイズを35pxから27pxに縮小 */
    border: 1px solid #000;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.piece {
    width: 25px;
    height: 25px;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
}

#score, #current-piece, #remaining, #message, #four-way-count-display {
    font-size: 20px;
    margin-bottom: 10px;
}

#current-piece-display, #score-display, #remaining-display, #four-way-count {
    font-weight: bold;
}

#current-piece-display {
    display: inline-block;
}

#message {
    min-height: 24px; /* ダミースペースを確保 */
}

#buttons {
    margin-top: 20px;
}

#reset-button, #sound-button {
    font-size: 20px;
    padding: 10px;
    margin-top: 10px;
}