* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    font-family: Arial, sans-serif;
    background-color: #f0f0f0;
}

.game-container {
    position: relative;
    width: 80%;
    height: 300px;
    border: 2px solid #333;
    overflow: hidden;
    background-color: #fff;
}

#player {
    position: absolute;
    bottom: 0;
    left: 50px;
    width: 30px;
    height: 30px;
    background-color: #4CAF50;
}

#obstacle {
    position: absolute;
    bottom: 0;
    right: -30px;
    width: 30px;
    height: 30px;
    background-color: #f44336;
    animation: obstacleMove 2s linear infinite;
}

@keyframes obstacleMove {
    from { right: -30px; }
    to { right: 100%; }
}

#score {
    position: absolute;
    top: 10px;
    left: 10px;
    font-size: 20px;
    color: #333;
}