W3Schools Tryit Editor

<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
<body>

<div class="w3-container">
  <h2>Navigation Bar with Input and Buttons</h2>

<p>Input and button inside navbar:</p>
  <div class="w3-bar w3-light-grey w3-border">
    <a href="#" class="w3-bar-item w3-button w3-mobile">Home</a>
    <a href="#" class="w3-bar-item w3-button w3-mobile">Link 1</a>
    <a href="#" class="w3-bar-item w3-button w3-mobile">Link 2</a>
    <input type="text" class="w3-bar-item w3-input w3-white w3-mobile" placeholder="Search..">
    <button class="w3-bar-item w3-button w3-green w3-mobile">Go</button>
  </div>
  
  <p>Padded navbar:</p>
  <div class="w3-bar w3-light-grey w3-border w3-padding">
    <a href="#" class="w3-bar-item w3-button w3-mobile">Home</a>
    <a href="#" class="w3-bar-item w3-button w3-mobile">Link 1</a>
    <a href="#" class="w3-bar-item w3-button w3-mobile">Link 2</a>
    <input type="text" class="w3-bar-item w3-input w3-white w3-mobile" placeholder="Search..">
    <button class="w3-bar-item w3-button w3-green w3-mobile">Go</button>
  </div>
</div>

</body>
</html>