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

body {
    font-family: Arial, sans-serif;
    background: black;
    color: white;
    overflow: hidden;
}

canvas {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    border-radius: 16px;
}

#game-over {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.8);
    padding: 20px;
    border-radius: 10px;
    text-align: center;
}

button {
    background: red;
    color: white;
    border: none;
    padding: 10px;
    cursor: pointer;
    font-size: 18px;
    margin: 5px;
}