Login Form in un menu

https://www.w3schools.com/howto/tryit.asp?filename=tryhow_css_login_form_navbar

<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<style>
* {box-sizing: border-box;}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
}

.topnav {
  overflow: hidden;
  background-color: #e9e9e9;
}

.topnav a {
  float: left;
  display: block;
  color: black;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
}

.topnav a:hover {
  background-color: #ddd;
  color: black;
}

.topnav a.active {
  background-color: #2196F3;
  color: white;
}

.topnav .login-container {
  float: right;
}

.topnav input[type=text] {
  padding: 6px;
  margin-top: 8px;
  font-size: 17px;
  border: none;
  width:120px;
}

.topnav .login-container button {
  float: right;
  padding: 6px 10px;
  margin-top: 8px;
  margin-right: 16px;
  background-color: #555;
  color: white;
  font-size: 17px;
  border: none;
  cursor: pointer;
}

.topnav .login-container button:hover {
  background-color: green;
}

@media screen and (max-width: 600px) {
  .topnav .login-container {
    float: none;
  }
  .topnav a, .topnav input[type=text], .topnav .login-container button {
    float: none;
    display: block;
    text-align: left;
    width: 100%;
    margin: 0;
    padding: 14px;
  }
  .topnav input[type=text] {
    border: 1px solid #ccc;  
  }
}
</style>
</head>
<body>

<div class="topnav">
  <a class="active" href="#home">Home</a>
  <a href="#about">About</a>
  <a href="#contact">Contact</a>
  <div class="login-container">
    <form action="/action_page.php">
      <input type="text" placeholder="Username" name="username">
      <input type="text" placeholder="Password" name="psw">
      <button type="submit">Login</button>
    </form>
  </div>
</div>

<div style="padding-left:16px">
  <h2>Responsive Login Form in Navbar</h2>
  <p>Navigation menu with a login form and a submit button inside of it.</p>
  <p>Resize the browser window to see the responsive effect.</p>
</div>

</body>
</html>

https://www.w3schools.com/howto/tryit.asp?filename=tryhow_css_login_form_navbar

<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<style>
* {box-sizing: border-box;}

body {
margin: 0;
font-family: Arial, Helvetica, sans-serif;
}

.topnav {
overflow: hidden;
background-color: #e9e9e9;
}

.topnav a {
float: left;
display: block;
color: black;
text-align: center;
padding: 14px 16px;
text-decoration: none;
font-size: 17px;
}

.topnav a:hover {
background-color: #ddd;
color: black;
}

.topnav a.active {
background-color: #2196F3;
color: white;
}

.topnav .login-container {
float: right;
}

.topnav input[type=text] {
padding: 6px;
margin-top: 8px;
font-size: 17px;
border: none;
width:120px;
}

.topnav .login-container button {
float: right;
padding: 6px 10px;
margin-top: 8px;
margin-right: 16px;
background-color: #555;
color: white;
font-size: 17px;
border: none;
cursor: pointer;
}

.topnav .login-container button:hover {
background-color: green;
}

@media screen and (max-width: 600px) {
.topnav .login-container {
float: none;
}
.topnav a, .topnav input[type=text], .topnav .login-container button {
float: none;
display: block;
text-align: left;
width: 100%;
margin: 0;
padding: 14px;
}
.topnav input[type=text] {
border: 1px solid #ccc;
}
}
</style>
</head>
<body>

<div class="topnav">
<a class="active" href="#home">Home</a>
<a href="#about">About</a>
<a href="#contact">Contact</a>
<div class="login-container">
<form action="/action_page.php">
<input type="text" placeholder="Username" name="username">
<input type="text" placeholder="Password" name="psw">
<button type="submit">Login</button>
</form>
</div>
</div>

<div style="padding-left:16px">
<h2>Responsive Login Form in Navbar</h2>
<p>Navigation menu with a login form and a submit button inside of it.</p>
<p>Resize the browser window to see the responsive effect.</p>
</div>

</body>
</html>