body {
    font-family: sans-serif;
    text-align: center;
    background-color: #fffde7;
}
#gameArea {
    width: 500px;
    height: 300px;
    margin: 20px auto;
    background-color: #ffffff;
    border: 2px solid #000;
    position: relative;
    overflow: hidden;
}
#player, #enemy, #estrella {
    position: absolute;
    width: 32px;
    height: 32px;
    font-size: 28px;
}
#player { left: 10px; top: 10px; }
#enemy { left: 450px; top: 250px; }
#estrella { left: 200px; top: 150px; }
button {
    padding: 10px 20px;
    font-size: 16px;
    margin-top: 10px;
}