How to fix design in navbar being deleted when clicked?-CodePudding

I am just learning to code and was looking to understand and recreate this: https://www.w3schools.com/howto/tryit.asp?filename=tryhow_js_topnav.

EDIT:

I wanted it to work without using the stylesheet from FontAwesome.

The problem is that it works when I run the code snippet here, but not on my computer. It loses format and does this: picture. Does anyone know what I do wrong?

function myFunction() {
  var x = document.getElementById("myTopnav");
  if (x.className === "topnav") {
    x.className  = " responsive";
  } else {
    x.className = "topnav";
  }
}

body {
  margin: 0;
  font-family: ;
  width: ;
  padding: ;
}

.topnav {
  overflow: hidden; 
  background-color: yellow;
}

.topnav a {
  float: left; 
  display: block; 
  color: red; 
  text-align: ;
  padding: 14px; 
  text-decoration: none; 
  font-size: ;
}

.topnav a:hover {
  background-color: orange;
  color: white;
}

.topnav a.active {
  background-color: turquoise;
  color: white;
}

.topnav .icon {
  display: none;
}

@media screen and (max-width: 600px) {
  .topnav a:not(:first-child) {display: none;}
  .topnav a.icon {
    float: right;
    display: block;
  }
}

@media screen and (max-width: 600px) {
  .topnav.responsive {position: relative;}
  .topnav.responsive .icon {
    position: absolute;
    right: 0;
    top: 0;
  }
  .topnav.responsive a {
    float: none;
    display: block;
    text-align: left;
  }
}

<!DOCTYPE html>
    <html lang="nb">
        <head>
          <meta charset="UTF-8">
          <meta http-equiv="X-UA-Compatible" content="IE=edge">
          <meta name="viewport" content="width=device-width, initial-scale=1.0">
          <link rel='stylesheet' href="./css/style.css">
        </head>
<header>

</header>   
<body>
  <div  id="myTopnav">
    <a href="index.html" >Hjem</a>
    <a href="tjenester.html">Tjenester</a>
    <a href="kontakt.html">Kontakt</a>
    <a href="om-oss.html">Om oss</a>
    <a href="javascript:void(0);"  onclick="myFunction()">&#9776;</a>
  </div>
  
  <div>
    <h2>Welcome</h2>
    <p>Hi</p>
  </div>

  <script src="./js/javascript.js"></script>
</body>
</html>

Can someone also explain exactly what this does:

<a href="javascript:void(0);"  onclick="myFunction()"> <i ></i></a>

CodePudding user response：

I think you are missing FontAwesome. Try adding this to your header

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">