#difficulty-select {
    font-size: 16px;      
    padding: 8px 12px;    
    border-radius: 4px;   
}

body {
    font-family: Arial, Helvetica, sans-serif;
    text-align: center;
    background: url("./mario-bg.jpg");
    background-size: cover;
    margin: 0;
    padding: 10px;
    box-sizing: border-box;
}

#board {
    width: 100%;
    max-width: 540px;
    aspect-ratio: 1 / 1;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;

    background: url("./soil.png");
    background-size: cover;
    border: 3px solid white;
    border-radius: 25px;
    box-sizing: border-box;
}

#board div {
    width: 33.33%;
    height: 33.33%;
    background-image: url("./pipe.png");
    background-size: cover;
    box-sizing: border-box;
    display: flex;
    align-items: center;
    justify-content: center;
}

#board div img {
    width: 85%;
    height: 85%;
    object-fit: contain;

    user-select: none;
    -moz-user-select: none;
    -webkit-user-drag: none;
    -webkit-user-select: none;
    -ms-user-select: none;
}