body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
}

#navbar {
    background-color: #333;
    color: #fff;
    padding: 20px;
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 20%;
}

#navbar header {
    font-size: 25px;
    font-weight: 600;
}

#navbar a {
    color: #fff;
    text-decoration: none;
    font-size: 20px;
}

#navbar li {
    padding: 0 0 10px;
}

#navbar ul {
    list-style-type: none;
    padding: 10px 0;
}

#main-doc {
    margin-left: 23%;
    padding: 20px;
}

.main-section header {
    font-size: 25px;
    font-weight: 600;
    margin-bottom: 20px;
}

code {
    display: block;
    background-color: #f1f1f1;
    padding: 10px;
    margin-bottom: 10px;
}

.main-section {
    margin-bottom: 40px;
}

.main-section li {
    padding: 0 0 5px;
}


@media (max-width: 768px) {
    #navbar {
      width: 100%;
      position: static;
      height: auto;
    }
  
    #main-doc {
      margin-left: 0;
      padding: 20px;
      width: 100%;
    }
}