* {
    /*初始化样式*/
    margin: 0;
    padding: 0;
  }
  html {
    /*用于 获取 屏幕的可视宽高*/
    width: 100%;
    height: 100%;
    overflow: scroll;
  }
  body {
    /*让 body 初始 width 和 height 就 等于 页面可视区域的 宽高*/
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    /*用于 测试的 样式*/
    letter-spacing: 4px;
    font-size: 18px;
    /*文字居中*/
    display: flex;
    justify-content: center;
    align-items: center;
  }
  @media screen and (orientation:portrait) {
    /*竖屏样式*/
    body {
      width: 100%;
      height: 100%;
      transform-origin: 0 0;
      transform: rotateZ(90deg) translateY(-100%);
      font-size: 20px;
    }
    #tutorial {

      transform: scale(0.5);
      border: 2px solid black;
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      margin: auto;
    }
    #buttom {
      transform: scale(0.5);
      border: 2px solid black;
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      margin: auto;
      z-index: -1;
    }
    #control{
      top: 10px;
      left: 10px;
      transform: scale(0.5);
    }
    #information{
      right: 10px;
      top: 10px;
      transform: scale(0.5);
    }
    label {
      font-size: 30px;
    }
    p{
      font-size: 20px;
    }
  }
    #buttom {
      border: 2px solid black;
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      margin: auto;
      z-index: -1;
    }
    #tutorial {
      border: 2px solid black;
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      margin: auto;
    }
    #control{
      position: absolute;
      left: 30px;
      user-select: none;
    }
    #control{
      position: absolute;
      top: 30px;
      left: 30px;
      width: 200px;
      border: 2px black;
      border-width: px;
      border-radius: 10px;
      background-color: rgba(173, 166, 166, 0.253);
    }
    #information{
      user-select: none;
      position: absolute;
      top: 30px;
      right: 30px;
      width: 200px;
      border: 2px black;
      border-width: px;
      border-radius: 10px;
      background-color: rgba(173, 166, 166, 0.253);
    }
    #mu2{
    top: 10%;
    width: 50%; /* 调整搜索框的宽度 */
    padding: 2px;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-family: "Comic Sans MS", cursive, sans-serif;  
    text-align: center;
  }
  #epsilon2{
    top: 10%;
    width: 50%; /* 调整搜索框的宽度 */
    padding: 2px;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-family: "Comic Sans MS", cursive, sans-serif;  
    text-align: center;
  }
  label{
    user-select: none;
    font-family: "Comic Sans MS", cursive, sans-serif;  
  }
  p {
    user-select: none;
    font-family: "Comic Sans MS", cursive, sans-serif;  
  }

  /* 侧边栏 */
.sidebar a {
  user-select: none;
  font-family: "Comic Sans MS", cursive, sans-serif; 
  font-size: 100px;
  text-decoration: none;
  color: white;
  font-weight: bold;
  transition: color 0.3s ease;
  position: absolute; 
  left: -80px; /* 将它们放在屏幕之外 */
  transition: 0.3s; /* 在悬停时添加过渡 */
  padding: 15px; /* 15px 内边距 */
  width: 100px; /* 设置特定宽度 */
  text-decoration: none; /* 删除下划线 */
  font-size: 20px; /* 增加字体大小 */
  color: rgba(255, 255, 255, 0); /* 白色文本颜色 */
  border-radius: 0 5px 5px 0; /* 右上角和右下角的圆角 */
  z-index: 1;
  text-align: left;
}


.sidebar a:hover {
  text-align: center;
  left: 0; 
  color: white;
}

#return {
  bottom:40px;
  background-color: #4c6aaf;
}