.row.content {
        height: 1500px;
    }
    

    .sidenav {
      background-color: #f1f1f1;
      height: 100%;
    }
    

    footer {
      background-color: #555;
      color: white;
      padding: 15px;
    }
    

    @media screen and (max-width: 767px) {
      .sidenav {
        height: auto;
        padding: 15px;
        }
      
        .row.content {height: auto;} 
    }