body{margin:0;font-family:Arial,sans-serif;background-color:#000;color:#fff}.form-container{padding:40px;max-width:600px;margin:auto}input{display:block;width:100%;margin:10px 0;background:#000;border:none;border-bottom:1px solid white;color:#fff;padding:10px 0}button{padding:5px 15px;margin-top:10px}.success{color:green}.error{color:red}.profile-container{padding:40px}.header{display:flex;justify-content:space-between;background:#222;padding:10px;border-bottom:1px solid white}.header a{margin-left:20px;color:#fff;text-decoration:none}