body {
    font-family: Arial, sans-serif;
    text-align: center;
    background-color: #2b2b2b;
    color: white;
    margin: 0;
    padding: 0;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    background-color: #333;
}

header h1 {
    flex-grow: 1;
    text-align: center;
    font-size: 2rem;
    color: #f0f0f0;
}

#settings {
    background-color: #444;
    border-radius: 8px;
    padding: 20px;
    max-width: 300px;
    margin: 20px auto;
    box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.5);
}

#settings label, #settings select, #settings input {
    display: block;
    width: 100%;
    margin-bottom: 10px;
    font-size: 1rem;
}

#settings select, #settings input {
    padding: 5px;
    border-radius: 5px;
    border: 1px solid #888;
    background-color: #555;
    color: #fff;
}

#startGame {
    padding: 10px;
    background-color: #5a5a5a;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

#startGame:hover {
    background-color: #777;
}

#customSettings {
    display: none;
}

#gameBoard {
    display: inline-block;
    margin: 20px;
}

.cell {
    width: 30px;
    height: 30px;
    display: inline-block;
    text-align: center;
    vertical-align: middle;
    font-size: 20px;
    cursor: pointer;
    background-color: #eee;
    color: #333;
    border: 2px solid #bbb;
    box-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3), -2px -2px 4px rgba(255, 255, 255, 0.5);
    transition: background-color 0.3s, box-shadow 0.2s;
}

.cell:active {
    box-shadow: inset 2px 2px 4px rgba(0, 0, 0, 0.3);
    background-color: #ddd;
}

.revealed {
    background-color: #ccc;
    color: #000;
    box-shadow: none;
}

.mine {
    background-color: #ff3333;
    color: white;
}