#btn-menu {
    display: none;
}

@media screen and ( max-width: 700px ) {    

   #btn-menu{
       position: fixed;
       top: 10px;
       right: 10px;
       display: block;
       color:black;
            
       z-index: 5;       
   } 

   #btn-menu:hover {    
    color:black;
    background-color: white;          
  }
   header .desk-nav {
       display: none;
   }




}

.sidenav {
    height: 100%;
    width: 0;
    position: fixed;
    z-index: 6;
    top: 0;
    left: 0;    
    background-color: rgb(70, 82, 140);
    overflow-x: hidden;
    transition: 0.5s;
    padding-top: 60px;
  }
  
  .sidenav a {
    padding: 8px 8px 8px 32px;
    text-decoration: none;
    font-size: 20px;    
    color:rgb(230, 230, 230);
    display: block;
    transition: 0.3s;
  }
  
  .sidenav a:hover {
    color: #f1f1f1;
  }
  
  .sidenav .cross.closebtn {
    position: absolute;
    top: 0;
    right: 25px;
    font-size: 36px;
    margin-left: 50px;
  }
  
  #main {
    transition: margin-left .5s;
    padding: 16px;
  }

  @media screen and (max-height: 450px) {
    .sidenav {
      padding-top: 15px;
    }
    .sidenav a {
      font-size: 18px;
    }
  }