#ding{
    position: relative; 
    margin-left: 200px; 
  }
  h2{font-size: 20px;
    color: rgb(225, 184, 18); 
    position:absolute;
    top:250px; 
    left:250px; 
  
  }                 
  #bgpicture{
        display:block;
  width: 100%; 
        height: 300px;
        border: none;
        overflow: hidden;
     }

     .nav{
        margin-left: 225px;
        height: 40px;
        background-color: rgb(250, 115, 19);
        box-shadow: 0px 1px 2px rgb(252, 249, 62);
        position: relative;
                }
                *{
                    margin: 0;
                    padding: 0;
                    text-decoration: none;
                    list-style: none;
                 }
                    .li{
                        float:left ;
                        width: 100px;
                        height: 40px;
                        text-align: center;
                        line-height: 40px;
                       }
                            .li a {
                                   display: block;
                                   color: rgb(254, 254, 254);
                 
                                  }
                                     .li a:hover{
                                                 background-color: rgb(240, 61, 16);
                                                }
  .sidenav {
              width: 225px;
              height: 100%;
             display: flex;
             justify-content: center;
             align-items: center;
              flex-direction: column;
              border-radius: 10px;
               transition: .3s;
            position: fixed;
             flex-direction: column;
            flex-wrap: nowrap;
             align-content: center;
              justify-content: flex-start;
              background-color: rgba(250, 235, 215, 0.546);
  }
.sidenav a {
             display: block;
               height: 10%;
             width: 50%;
            margin: 25px;
             border-radius: 10px;
            position: relative;
            color: rgb(250, 115, 19);
 }
.sidenav a:hover {
color: rgb(240, 61, 16);
          }

          
.nian{
    margin-left: 225px;
}
.xi{
    margin-left: 225px;
}
.lin{
    margin-left: 225px;
    
}      
.yue{
    margin-left: 225px;
}
.ri{
    margin-left: 700px;
}