style.css

body {
   margin: 0;
   min-height: 100vh;
   background-color: rgb(226, 197, 177);
   display: flex;
   justify-content: center;
   align-items: center;
   background-image: url(mountains1.jpg);
  }

  nav {
   position: fixed;
   left: 1rem;
   top: -5px;
   background-color: #eee;
   border: 1px solid #999;
   border-radius: 5px;
   border-width: 0 1px 1px 1px;
   padding: .5rem;
  }

  nav a:hover {
   background-color: #ddd;
   padding: .5rem 0;
   color: #333;
  }

  div {
   min-height: 50vh;
   width: 50vh;
   background-color: transparent;
   border: 10px solid rgba(255, 0, 0, .5);
   border-radius: 50%;
   box-shadow: 0 0 0 1000px #f00;
   box-sizing: border-box;
   text-align: center;
   padding: 1rem;
  }

  p {
   font-family: sans-serif;
   font-size: 1.5rem;
   text-shadow: 1px 1px 5px cornsilk
  }