body{ 
  background-image: url("https://img.freepik.com/vecteurs-libre/fond-bleu-degrade_23-2149328582.jpg?w=740&t=st=1716125106~exp=1716125706~hmac=f885c77261c880ca0af3ac637487f0dc7c4f3065e463d2ea42c65e1cd22cc199");
  background-position: center;
  background-size: contain;
  background-size: cover;
  background-repeat: no-repeat;

}
.topnav {
            background-color: blue;
            color: white;
            overflow: hidden;
            width: 100%;
            position: fixed;
            top: 0;
            margin-top:0px;;
	          padding:0
        }
 
        .topnav a {
            float: left;
            display: block;
            color: white;
            text-align: center;
            padding: 14px 16px;
            text-decoration: none;
            font-size: 20px;
            margin-bottom:2px;
        }    