body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    font-family: Arial, sans-serif;
    background-color: #222;
}

#game-container {
    position: relative;
    width: 100vw;
    height: 100vh;
}

#game-canvas {
    display: block;
    background-color: #111;
}

#game-ui {
    position: absolute;
    top: 10px;
    left: 10px;
    color: white;
    font-size: 20px;
}

#timer {
    margin-bottom: 10px;
}

.tank {
    position: absolute;
    width: 40px;
    height: 40px;
    background-color: #4CAF50;
    transform-origin: center;
}

.bullet {
    position: absolute;
    width: 5px;
    height: 5px;
    background-color: #f00;
    border-radius: 50%;
}

.wall {
    position: absolute;
    background-color: #555;
}