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


#navbar {
  width: 250px;
  background-color: #f4f4f4;
  border-right: 2px solid #ccc;
  height: 100vh;
  position: fixed;
  padding: 20px;
  box-sizing: border-box;
}

#navbar header {
  font-size: 24px;
  font-weight: bold;
  margin-bottom: 20px;
  text-align: center;
}

#navbar ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

#navbar li {
  border: 1px solid #ccc;
  padding: 10px;
  margin-bottom: 10px;
  background-color: white;
  border-radius: 4px;
  text-align: center;
}

.nav-link {
  text-decoration: none;
  color: #333;
  display: block;
}

.nav-link:hover {
  background-color: #e0e0e0;
}

code {
  font-size: 15px;
}

#main-doc {
  margin-left: 270px; 
  padding: 40px 30px;
}

.main-section {
  margin-bottom: 50px;
}

.main-section header {
  font-size: 30px;
  margin-bottom: 10px;
  border-bottom: 2px solid #ccc;
  padding-bottom: 5px;
  padding-left: 5px;
}

p {
  text-indent: 20px;
  margin-top: 15px;
  margin-bottom: 0px;
  line-height: 1.6;
}

.coding {
  background-color: #f9f9f9;
  border: 1px solid #ccc;
  padding: 0px 15px 15px 15px;
  border-radius: 5px;
}

.coding code {
  display: block;
  font-family: monospace;
  color: #222;
  line-height: 1.4;
}

@media (max-width: 768px) {
  body {
    flex-direction: column;
  }

  #navbar {
    position: relative;
    width: 100%;
    height: auto;
    border-right: none;
    border-bottom: 2px solid #ccc;
  }

  #main-doc {
    margin-left: 0;
    padding: 20px 15px;
  }

  .main-section header {
    font-size: 24px;
  }

  code {
    font-size: 14px;
  }

  #navbar li {
    margin-bottom: 8px;
    padding: 8px;
  }

  #navbar header {
    font-size: 20px;
    margin-bottom: 10px;
  }
}