body {
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #66ccff40;
}

.container {
    position: relative;
    width: 320px;
    height: 480px;
}

canvas {
  border: 2px solid #000;
  background-color: #4EC0CA;
  width: 100%;
  height: 100%;
}

.screen {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    background-color: rgba(255, 255, 255, 0.9);
    padding: 20px;
    border-radius: 10px;
    z-index: 100;  /* 添加 z-index 确保显示在画布上层 */
}

/* 移除默认的 display: none */
#startScreen {
    display: block;  /* 确保开始界面默认显示 */
}

#gameOverScreen {
    display: none;
}

/* 添加一些文字样式 */
.screen h1 {
    color: #333;
    margin-bottom: 15px;
}

.screen p {
    font-size: 18px;
    margin-bottom: 15px;
}

button {
    padding: 10px 20px;
    font-size: 18px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    margin-top: 10px;
}

button:hover {
    background-color: #45a049;
}