body {
    background: rgb(171, 196, 255);  
    margin: 0;
  }
    
  h1 {
    font-size: 24px;
    margin-top: 10px;
  }
  
.mainbody {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    background-color: white;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  }
  
  article {
    margin-bottom: 30px;
  }
  
  h2 {
    font-size: 23px;
    margin-bottom: 10px;
    color: #0073e6;
  }
  
  p {
    font-size: 19px;
    line-height: 1.5;
  }
  
  a {
    text-decoration: none;
    color: #0073e6;
  }
  
  a:hover {
    text-decoration: underline;
  }
  
  ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #333;
  }
  
  li {
    float: left;
  }
  
  li a {
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
  }

  div.fixed {
    position: fixed;
    top: 0;
    right: 0;
    width: 100px;
    padding: 30px;
  }

  li a:hover:not(.active) {
    background-color: #111;
  }
  
  .active {
    background-color: rgb(0, 80, 157);
  }
