html {
          background: repeating-radial-gradient(rgb(210, 103, 15), rgb(23, 225, 40) 20px);
          background-size: 8px 8px;
          padding: 24px;
      }
      
      body {
          font-size: 16px;
          background-color: #00E600;
          border: 6px solid lightseagreen;
          border-radius: 16px;
          padding: 24px;
          margin-left: auto;
          margin-right: auto;
      }
      
      h1 {
          color: blue;
          font-size: 3.5rem;
      }
      
      h2 {
          font-size: 2.3rem;
          color: blue;
          text-align: center;
      }
      
      h3 {
          color: blue;
      }
      
      p {
          font-size: 1.9rem;
          color: blue;
      }
      
      img {
          width: 450px;
          max-width: 100%;
          border: 7px solid #111111;
          border-radius: 30px;
      }
      
      li {
          font-size: 1.9rem;
          color: blue;
      }
      
      nav ul {
          list-style-type: none;
          background-color: maroon;
          border: 4px solid yellow;
          border-radius: 10px;
          font-family: sans-serif;
          font-weight: bold;
          padding: 16px;
      }
      
      nav ul li {
          display: inline;
          border-right: 2px solid yellow;
          padding-right: 8px;
          padding-left: 8px;
      }
      
      nav ul li:last-child {
          border-right: none;
      }
      
      nav ul li a {
          text-decoration: none;
          color: red;
      }
      
      nav ul li a:hover {
          text-decoration: underline;
          color: yellow;
      }
      
      nav li.selected {
          color: #606060;
      }
      
      head {
          background-color: yellow;
      }
      
      footer {
          background-color: purple;
          border-radius: 7px;
          font-size: 35px;
          text-align: center;
      }
      
      article {
          background-color: aqua;
          border-radius: 7px;
          padding-left: 15px; 
          padding-right: 15px
      }
      
      aside {
          font-size: x-large;
          background-color: orange;
          position:  absolute;
      }
      
      header {
          background-color: red;
      }
      
      section {
          background-color: aquamarine;
          border-radius: 7px;
          border: 4px solid yellowgreen;
          margin-bottom: 5px;
      }