body {
    font-family: Arial, sans-serif;
    background-color: #f0f0f0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
    box-sizing: border-box;
}

.container {
    text-align: center;
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h1 {
    color: #333;
    margin-bottom: 20px;
}

canvas#gameCanvas {
    border: 1px solid #000;
    background-color: #222; /* 深色背景，模拟太空 */
    display: block; /* 移除 canvas 下方的额外空间 */
    margin: 0 auto 20px auto; /* 上下20px，左右自动居中 */
}

.controls-info {
    font-size: 0.9em;
    color: #555;
}