* {
    box-sizing: border-box;
  }

  .container {
    width: 80%;
    margin: 0 auto;
  }

  .header {
    background-color: #333;
    color: white;
    padding: 20px;
    font-family: Arial, sans-serif;
    font-size: 24px;
    text-align: center;
  }

      
  .footer {
    background-color: #433d3d;
    color: rgb(226, 236, 236);
    padding: 10px;
    font-family: 'Times New Roman', Times, serif;
    font-size: 12px;
    text-align: center;
  }

  .footer a {
    text-decoration: none;
    color: rgb(238, 243, 243);
  }

  .nav {
    display: flex;
    color: cyan;   
    background-color: #666;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
  }

  .nav a {
    text-decoration: none;
    color: rgb(238, 243, 243);
    font-family: 'Open Sans', 'Helvetica Neue';
    font-size: 16px;
  }

  .nav a:hover {
    color: #999;
  }

  .nav_tech {
    display: flex;
    color: rgb(27, 184, 87);   
    background-color: #777;
    justify-content: space-between;
    text-transform: capitalize;
    align-items: center;
    padding: 10px;
  }

  .nav_tech a {
    text-decoration:none;  
    color: rgb(238, 243, 243);
    font-family: 'Open Sans', 'Helvetica Neue';
    font-size: 16px;
  }

  .nav_tech a:hover {
 
    color: #f11;
  }

  .main {
    display: flex;
    height: 500px;
    margin-top: 1px;
    margin-bottom: 1px;
  }

  .sidebar {
    width: 25%;
    background-color: #f0f0f0;
    padding: 20px;
    overflow-y: scroll;
  }

  .sidebar h3 {
    font-family: Arial, sans-serif;
    font-size: 20px;
    color: #333;
  }

  .sidebar ul {
    list-style-type: none;
    padding-left: 0;
  }

  .sidebar li {
    margin-bottom: 10px;
  }

  .sidebar li a {
    text-decoration: none;
    color: #333;
    font-family: Arial, sans-serif;
    font-size: 12px;
  }

  .sidebar li a:hover {
    color: #999;
  }

  .content {
    width: 75%;
    background-color: #f1f1f1;
    padding: 20px;
    text-align: justify;
    overflow-y: scroll;
  }

  .content h2 {
    font-family: Arial, sans-serif;
    font-size: 22px;
    color: #333;
    text-align: center;
  }

  .content p {
    font-family: 'Times New Roman', Times, serif;
    font-size: 16px;
    color: #333;
    line-height: 1.5;
  }