html,body{height:100%;margin:0;padding:0}body{color:#e0e0e0;background:url(assets/background.png) 50%/cover no-repeat fixed;flex-direction:column;font-family:Orbitron,sans-serif;display:flex}nav{background-color:#000000b3;padding:10px}nav ul{text-align:center;margin:0;padding:0;list-style:none}nav ul li{margin:0 15px;display:inline-block}nav ul li a{color:red;font-size:20px;text-decoration:none}header h1{text-align:center;color:red;margin:20px 0;font-size:48px}.main-content{text-align:center;flex:1;padding:20px}.main-content img{border:2px solid red;border-radius:5px;max-width:90%;height:auto}footer{text-align:center;background-color:#000000b3;padding:20px 0}footer p{color:#e0e0e0;font-size:16px}