body {
  background-image: url("/image/texture/coolspace.gif");
  color: white;
  padding:10px;
  }
  
  a:link {
    color: yellow;
    
    }
    
  a:visited {
    color: cyan;
    
    }  
    
  main, nav, footer, .back {
    background-color:gray;
    color:white;
    margin:50px;
    border:double black 20px;
    text-shadow:1px 1px 0px black;
    padding:10px;
    } 
    
    nav ul, ol {
      display:flex;
      flex-wrap:wrap;
      gap:2rem;
    } 
    
  .frame {
    border:solid 5px black;
    }
    
  .flex {
    display:flex;
    }  
    
  .warning {
    background-color:red;
    color:white;
    font-weight:bold;
  }