body {
    background-color: #f8f9fa;
    font-family: 'Segoe UI', sans-serif;
    text-align: center;
    padding: 20px;
}

h1 {
    color: #2c3e50;
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

#gameBoard {
    display: grid;
    grid-template-columns: repeat(7, 70px);
    grid-template-rows: repeat(6, 70px);
    gap: 15px;                    
    justify-content: center;
    margin: 30px auto;
    background-color: #add8e6;    
    padding: 15px;             
    border-radius: 15px; 
    box-shadow: 0 0 10px rgba(0,0,0,0.2);
    max-width: calc(7 * 70px + 6 * 15px + 30px);
}

.cell {
    width: 70px;
    height: 70px;
    background-color: #ecf0f1;
    border: 2px solid #2c3e50;
    border-radius: 50%;
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.2);
    cursor: pointer;
}

.cell.red {
    background-color: red;
}

.cell.yellow {
    background-color: gold;
}

#restartBtn {
    padding: 10px 20px;
    font-size: 1rem;
    border: none;
    background-color: #3498db;
    color: white;
    border-radius: 5px;
    cursor: pointer;
}

#restartBtn:hover {
    background-color: #2980b9;
}