*{
    /* 清除所有的padding、margin和border */
    margin: 0;
    padding: 0;
    border: 0;
  }
  body {
    background-color: #EFEEEE;
    /* 长按鼠标并滑动的时候回选中框内的内容，这里禁止选中所有文本。 */
    -moz-user-select:none;/*火狐*/
    -webkit-user-select:none;/*webkit浏览器*/
    -ms-user-select:none;/*IE10*/
    -khtml-user-select:none;/*早期浏览器*/
    user-select:none;
    cursor: url('cursor/pointer.cur'),auto;
    overflow: hidden;
  }

  .logo {
    z-index: 1;
    height: 10%;
    width: 10%;
    position: relative;
    margin-left: auto;
    margin-right: auto;
    display: block;
    top: 15px;
    border-radius: 42%;
    background-color: white;
    padding: 12px;
    animation: fadeIn 3.2s;
    -webkit-transition: all 1s;
    -moz-transition: all 1s;
    -o-transition: all 1s;
    transition: all 1s;
  }

  .logo:hover {
    height: 12%;
    width: 12%;
    top: 13px;
    background-color: #EFEEEE;
    margin-left: auto;
    margin-right: auto;
  }

  .logo:active {
    height: 13%;
    width: 13%;
    top: 10px;
    background-color: #f5f5dc;
  }

  #runtime_span {
    color: white;
    text-align: center;
    position: absolute;
    bottom: 0;
    left: 50.8%;
    transform: translate(-50%, -50%);
    animation: fadeIn 2.8s;
    font-size: 7px;
    font-weight: bold;
    -webkit-transition: font-size 1s;
    -moz-transition: font-size 1s;
    -o-transition: font-size 1s;
    transition: font-size 1s;
  }

  #runtime_span:hover {
    font-size: 8px;
  }

  #runtime_span:active {
    font-size: 10px;
  }

  .copyrightOwner {
    color: white;
    text-align: center;
    position: absolute;
    bottom: 10px;
    left: 50.8%;
    transform: translate(-50%, -50%);
    animation: fadeIn 2.8s;
    font-size: 8px;
    font-weight: bold;
    -webkit-transition: font-size 1s;
    -moz-transition: font-size 1s;
    -o-transition: font-size 1s;
    transition: font-size 1s;
  }

  .copyrightOwner:hover {
    font-size: 13px;
  }

  .copyrightOwner:active {
    font-size: 16px;
  }

  .links {
    color: aqua;
    cursor: url('cursor/link.cur'), auto;
    font-weight: bold;
  }

  .about {
    color: white;
    text-align: center;
    position: absolute;
    font-size: 10px;
    font-weight: bold;
    bottom: 20px;
    left: 50.8%;
    transform: translate(-50%, -50%);
    animation: fadeIn 2.8s;
    -webkit-transition: font-size 1s;
    -moz-transition: font-size 1s;
    -o-transition: font-size 1s;
    transition: font-size 1s;
  }

  .about:hover {
    font-size: 13px;
  }

  .about:active {
    font-size: 16px;
  }

  /*
  * 以下是背景盒子的属性设置
  */

  /* 两个盒子的属性主要是为了进行定位 */
  .backgroundBox1 {
    background-color:#f5f5dc;
    width: 645px;
    height: 430px;
    position: absolute;
    left: 49%;
    margin-left: -300px;
    top: 50%;
    margin-top: -200px;
    border-radius: 15%;
    box-shadow: 12px 12px 20px rgba(0, 0, 0, 0.5);
    box-shadow: 10px 10px 30px rgba(0, 0, 0, 0.2) inset;
    -webkit-transition: all 1s;
    -moz-transition: all 1s;
    -o-transition: all 1s;
    transition: all 1s;
  }

  .backgroundBox1:hover {
    background-color: #a8e9b1;
    -webkit-transition: all 2s;
    -moz-transition: all 2s;
    -o-transition: all 2s;
    transition: all 2s;
  }

  .backgroundBox1:active {
    background-color: #6fca3a;
    -webkit-transition: all 2s;
    -moz-transition: all 2s;
    -o-transition: all 2s;
    transition: all 2s;
  }

  .backgroundBox2 {
    width: inherit;
    height: inherit;
    position: relative;
  }

  /*
  * 时间布局
  */

  .time {
    text-align: center;
    color: #6B6B6B;
    margin-top: 30px;
    animation: fadeIn 3.2s;
    font-size: 30px;
    -webkit-transition: color 1s, font-size 1s;
    -moz-transition: color 1s, font-size 1s;
    -o-transition: color 1s, font-size 1s;
    transition: color 1s, font-size 1s;
  }

  .time:hover {
    font-size: 35px;
    color: #353434;
  }

  .time:active {
    color: #0b60aa;
  }

  /*
  *背景视频
  */

  #backgroundContainer {
    position: relative;
    width: 100%;
    height: 100vh;
  }

  #backgroundVideo,
  #backgroundImage {
    position: fixed;
    object-fit: cover;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 100%;
    display: inline-block;
    animation: fadeIn 0.3s;
    -webkit-transition: all 3s;
    -moz-transition: all 3s;
    -o-transition: all 3s;
    transition: all 3s;
  }

  @keyframes fadeIn {
    0% { opacity: 0; }
    100% { opacity: 1; }
  }

  #backgroundVideo:hover,
  #backgroundImage:hover {
    width: 105%;
    height: 105%;
    cursor: url(cursor/precision.cur), auto;
    -webkit-transition: all 3s;
    -moz-transition: all 3s;
    -o-transition: all 3s;
    transition: all 3s;
    background-repeat: no-repeat;
    background-size: cover;
    background-position: 50%;
    -webkit-filter: blur(3px);
    filter: blur(3px);
    -webkit-transform: scale(1);
    -ms-transform: scale(1);
    transform: scale(1);
  }

  #backgroundVideo:active,
  #backgroundImage:active {
    width: 120%;
    height: 120%;
    -webkit-transition: all 3s;
    -moz-transition: all 3s;
    -o-transition: all 3s;
    transition: all 3s;
    background-repeat: no-repeat;
    background-size: cover;
    background-position: 50%;
    -webkit-filter: blur(10px);
    filter: blur(10px);
    -webkit-transform: scale(1);
    -ms-transform: scale(1);
    transform: scale(1);
  }

/* 定义开关按钮的样式 */
.switch {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 34px;
}

/* 定义开关按钮的滑块样式 */
.switch .slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  -webkit-transition: .4s;
  transition: .4s;
}

/* 定义开关按钮的圆形滑块样式 */
.switch .slider:before {
  position: absolute;
  content: "";
  height: 26px;
  width: 26px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  -webkit-transition: .4s;
  transition: .4s;
}

/* 定义开关按钮的绿色样式 */
.switch input:checked + .slider {
  background-color: green;
}

/* 定义开关按钮的绿色滑块样式 */
.switch input:checked + .slider:before {
  -webkit-transform: translateX(26px);
  -ms-transform: translateX(26px);
  transform: translateX(26px);
}

  #backgroundVideo {
    display: none; /* 默认隐藏视频 */
  }
  
  /*
  * 以下是有关的搜索框的布局
  */

  #backgroundFormStyle {
    position: relative;
    height: 20%;
    width: inherit;
  }
  #searchForm {
    /* 搜索框的属性设置 */
    position: absolute;
    width: 500px;
    height: 40px;
    background-color: bisque;
    animation: fadeIn 1s;
    /* 盒子居中 */
    top: 50%;
    margin-top: -20px;
    left: 50%;
    margin-left: -250px;
    /* 圆角属性，可以根据自己的喜好调节，50%盒子就是个圆形 */
    border-radius: 20px;
    /* 两个阴影属性，做出凸起的效果。 */
    /* 第一个阴影为白色，向左和上移动。 */
    /* 第二个阴影为黑色，向右和下移动。 */
    /* 参数分别为：x方向偏移 y方向偏移 阴影模糊半径 颜色 */
    box-shadow: 12px 12px 20px rgba(0, 0, 0, 0.2);
    -webkit-transition: all 1s;
    -moz-transition: all 1s;
    -o-transition: all 1s;
    transition: all 1s;
  }

  #searchForm:hover {
    width: 584px;
    left: 43%;
    -webkit-transition: all 1s;
    -moz-transition: all 1s;
    -o-transition: all 1s;
    transition: all 1s;
  }

  /* 注意：这里是搜索框的样式，和网站入口按钮不同，没有鼠标悬停点击等状态效果。 */
  #searchInput {
    width: 90%;
    height: inherit;
    margin-left: 20px;
    background-color:bisque;
    /* outline用来清除点击搜索框的时候出现一个黑色小边框 */
    outline: none;
    cursor: url('cursor/beam.cur'), text;
  }

  #confirmInput {
    /* 把确认按钮变成黑色边框小圆圈 */
    width: 5%;
    height: 18px;
    width: 18px;
    position: absolute;
    right: 10;
    top: 50%;
    margin-top: -9px;
    outline: none;

  }
  #confirmInput:hover {
    /* 鼠标悬停到确认按钮上变成选择指针 */
    cursor: url('cursor/link.cur'), auto;
  }

  /*
  * 下面是关于网站入口的按钮布局
  */

  .iconBackBoxAll {
    position: absolute;
    /* 横向居中 */
    left: 50%;
    margin-left: -240px;
    bottom: 0;
    width: 480px;
    height: 70%;
    animation: fadeIn 1s;
  }
  .iconBackBoxAll>a {
    background-color: bisque;
    position: relative;
    /* 使用左浮动来布局 */
    float: left;
    width: 80px;
    height: 80px;
    margin: 20px;
    border-radius: 20%;
    box-shadow: 12px 12px 20px rgba(0, 0, 0, 0.2);
    /* 小手手 */
    cursor: url(cursor/link.cur), pointer;
    /* 动画，阴影过度，做出一个纸面下凹的效果。 */
    /* 参数：需要改变的样式（all是所有）  改变的时间  速度函数 */
    /* 注意注意注意！！！！
    * 这里必须填写速度函数，即便默认曲线就是ease，我也没搞清楚为啥。
    * 后面需要从外阴影过渡到内阴影。在测试的时候，如果不写速度函数曲线没有效果。
    * 其他样式，比如改变盒子宽高颜色没啥问题。希望有大佬帮忙解答一下原因。
    */
    transition: all .2s ease;
  }
  .iconBackBoxAll>a img {
    /* 图片定位 */
    position: absolute;
    width: 46px;
    height: 46px;
    top: 50%;
    margin-top: -30px;
    left: 50%;
    margin-left: -23px;
  }
  .iconBackBox>div {
    /* 文本定位 */
    position: absolute;
    width: 60px;
    bottom: 5px;
    left: 50%;
    margin-left: -30px;
    text-align: center;
  }
  .iconBackBox>div p {
    /* 文本样式 */
    color: #6B6B6B;
    font-size: 12px;
  }

  /*
  * 下面是关于网站入口的伪类选择器
  */

  .iconBackBoxAll>a:hover {
    /* 这里改变盒子阴影 */
    /*
    * 四个参数：
    * 前两个是黑白阴影从外阴影过渡到没有阴影
    * 后连个是黑白阴影从没有阴影过渡到内阴影
    */
    box-shadow: 0px 0px 0px rgba(0, 0, 0, 0.2),
    0px 0px 0px rgba(255, 255, 255, 1),
    12px 12px 20px rgba(0, 0, 0, 0.2) inset;
  }

  .iconBackBoxAll>a:active {
    /* 点击时改变样式，加深效果 */
    box-shadow: 10px 10px 30px rgba(0, 0, 0, 0.3) inset;
  }


  /*
  * 下面是对于增加和删除按钮的属性设置（还没写）
  */

  #addBut {
    background-image: url(icon/addButton.png);
    background-position: center;
    background-repeat: no-repeat;
    background-size: contain;

  #deleteBut {
    background-image: url(icon/delete.png);
    background-position: center;
    background-repeat: no-repeat;
    background-size: contain;
  }