nav {
    list-style-type: none;
    margin: 0;
    padding: 0;
    width: 25%;
    background-color: #f1f1f1;
    height: 100%;
    position: fixed;
    overflow: auto;
    top: 0;
    left: 0;
    bottom: 0;
    box-shadow: 2px 2px 2px #e2e2e2;
}

.nav-link {
    display: block;
    color: #000;
    padding: 8px 16px;
    text-decoration: none;
    font-size: 20px;
    font-weight: bold;
    text-align: center;
    align-self: auto;;
}

#nav-link {
    height: 80%;
    display: grid;
    align-content: space-evenly;
}
#nav-head {
    margin-top: 20px;
    margin-bottom: 10px;
    font-size: 25px;
}

main {
    float: right;
    width: 74%;
}

header {
    font-size: 20px;
    font-weight: bold;
    text-align: center;
    margin-top: 50px;
}

code {
    border-color: #e2e2e2;
    border-style: solid;
    border-width: 2px;
    padding: 10px;
    padding: 10px;
    display: flex;
    background-color: #f1f1f1;
    box-shadow: 2px 2px #a7a7a7;
}

footer {
    margin-top: 20px;
    margin-bottom: 20px;
    text-align: center;
}


.dropbtn {
    background-color: #f1f1f1;
    color: black;
    padding: 8px;
    font-size: 16px;
    border: none;
    margin-left: 0;
    
  }
  

  .dropdown {
    position: relative;
    display: inline-block;
  }
  

  .dropdown-content {
    display: none;
    position: absolute;
    background-color: #f1f1f1;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 2;
  }
  
 
  .dropdown-content a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
  }
  

  .dropdown-content a:hover {
      background-color: #e2e2e2;
    }
  

  .dropdown:hover .dropdown-content {
      display: block;
      z-index: 2;
    }
  
  
  .dropdown:hover .dropbtn {
      background-color: #e2e2e2;
    }


    @media (max-width: 600px) {
        #nav-link {
            display: none;
        }
        #nav-head {
            margin: auto;
          }
        .hr {
            display: none;
        }

        nav {
            height: auto;
            width: 100%;
            bottom: auto;
            display: flex;
        }

        main {
            width: 90%;
            float: none;
            margin-left: 15px;
        }
    }


    @media (min-width: 600px) {
        .dropdown {
            display: none;
        }
    }