* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }

  html,body{
      height: 100%;
      margin: 0;
      display: flex;
      flex-direction: column;
      max-height: 1000px;
  }
  
  .main-content {
    flex: 1;
    overflow-y: auto;
  }
  .container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: flex-start;
    padding: 20px;
    gap: 20px; /* Space between elements */
  }

  .container-blue {
    background-color: rgb(245, 236, 192);
    font-size: 18px;
    position: sticky;
  }

  header, footer {
    text-align: center;
    background-color: #333;
    color: #fff;
    padding: 10px 0;
  }

 

  header h1, footer p {
    font-size: 20px;
    font-style: bold;
  }
  

  .item {
    flex: 1 1 200px; /* Flex grow, shrink, and basis */
    min-width: 100px; /* Minimum width of each item */
    background-color: #f4f4f4;
    padding: 10px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .item a {
    text-decoration: none;
  }

  .item:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
  }

  @media (max-width: 768px) {
    .container {
      flex-direction: column; /* Stack items vertically */
      align-items: center;
    }

    .item {
        flex: 1 1 100%; /* Full width for small screens */
        margin-bottom: 10px;
    }
  }

  @media (max-width: 480px) {
    .item {
      flex: 1 1 100%; /* Ensure each item takes up full width on very small screens */
      margin-bottom: 10px;
      padding: 15px;
    }
  }

  main {
    flex: 3.5;
    height: max-content;
    background-color: #fff;
    padding: 30px 30px;
    min-height: 500px;
    border-radius: 8px;
    margin-left: 260px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  }
  
  aside {
    flex: 0.5;
  }
  
  aside h3 {
    color: #333;
  }

  table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    font-size: 18px;
    text-align: left;
}
th, td {
    border: 1px solid black;
    padding: 10px;
}
th {
    background-color: #007BFF;
    color: white;
}

code {
  background-color: #f4f4f4;
  padding: 10px;
  display: block;
  border-left: 5px solid #007BFF;
  margin: 10px 20px;
}

.list_data {
  padding: 10px;
}

aside{
  width: 250px;
  position: fixed;
  overflow-y: auto;
}

aside a{
  color: #333;
}

.coll_into, .key_feature, .imp_utility, .example{
  margin-top: 10px;
}