body{
    background-image: url(../img/R-C.gif);
    margin: 0;
} /*给body设置背景*/
.YeWei{
    width: 100%;
    height: 100px;
    background-color: gray;  /*设置页尾*/
    position: relative; /*相对定位*/
}
.div-0{
    width: 100%;
    height: 120px;
    background-color: rgb(205, 197, 197);
}   /*导航栏盒子设置宽高背景颜色*/
.img-0{
    height: 120px;  /*logo垂直居中*/
    
}
.ul-0{
    list-style: none;
    
    margin: 0;     /*清除样式*/
}
.li-0{
    float: right;
    width: 120px;
    line-height: 120px;
    text-align: center;   
    /*li标签右浮动，设置宽度，垂直居中*/
}
.ul-1{
    list-style: none;
    margin: 0 ;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);  /*绝对定位使
    超链接在盒子中垂直居中*/
}
.li-1{
   
    line-height: 100px;
    text-align: center;
    float: left;
}
.a-1{
    text-decoration: none;
    color: black;
}
.a-0{
    text-decoration: none; /*消除自带样式下划线*/
    color: black;   /*字体颜色*/
    font-size: 20px;  /*字体大小*/
}
.li-0 .a-0:hover{
    color:white ;  /*伪类鼠标划过变色*/
}
.div-1{
    width: 1300px;
    height:2400px;
    background-color: white;
    margin: 0 auto;
}
.div-3{
    
    height: 2300px;
    width: 900px;
    background-color:rgb(245,245,245) ;
    float: right;
    position: relative;
    top:60px;
    right: 50px;
    border-radius: 12px;
     padding-top: 20px;
   
}
.div-2{
    float: left;
    margin: 0 auto;
    width: 200px;
    background-color: rgb(245,245,245);
    border-radius: 12px;
    position:fixed;
    left: 10%;
    top: 180px;
}
.ul-3{
    float: left;
    width: 200px;
    padding: 0;
    list-style: none;
    margin: 0;
}
.a{
    width: 100%;
    height: 57px;   
    border-radius: 12px;
}
.a-1{
    color: #000;
    display:block;
   text-align: center;
   line-height: 57px;
  
}
.ul-3 li:hover{
    background-color: #EBFFF6;
    
}
.renai{
    text-align: center;
    font-size: 30px;
}
.ruxuetu1{
    float: right;
    width: 400px;
    height: 230px;
    padding-right:  10px;
}
.p1{
    padding-left: 10px;
    padding-right:10px;
    text-indent: 2em;
}
.lixuetu{
  float: left;
    width: 400px;
    height: 230px;
    padding-left:10px;
    padding-right: 10px;  
}
video{
    float: right;
    width: 400px;
    height: 400px;
    padding-top: 20px;
    padding-left: 20px;
    padding-right: 10px;
}