body {
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
}

#controls {
    margin-bottom: 20px;
}

#solving-board-container, #solutions-container {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

#solving-board, #solutions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

.board {
    display: grid;
    margin: 10px;
    border: 2px solid #dda071e1;
    grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
}

.cell {
    width: 40px;
    height: 40px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    transition: background-color 0.5s;
}

.cell:nth-child(odd) {
    background-color: #e7b287;

}

.cell:nth-child(even) {
    background-color: #f0d9b5;
}

.row-even .cell:nth-child(odd) {
    background-color: #f0d9b5;
}

.row-even .cell:nth-child(even) {
    background-color: #e7b287;
}

.cell.highlight {
    background-color: #ffff99 !important;
}

.no-solution {
    font-size: 18px;
    color: red;
    margin-top: 20px;
}