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/5/w3.css">
<body>

<div class="w3-container">
  <h2>Button Bars</h2>

<p>Two button groups on the same line (if enough space):</p>
  <div class="w3-show-inline-block">
  <div class="w3-bar">
    <button class="w3-button w3-black">Button</button>
    <button class="w3-button w3-teal">Button</button>
    <button class="w3-button w3-red">Button</button>
  </div>
  </div>
  <div class="w3-show-inline-block">
  <div class="w3-bar">
    <button class="w3-button w3-black">Button</button>
    <button class="w3-button w3-teal">Button</button>
    <button class="w3-button w3-red">Button</button>
  </div>
  </div>

<p>Two button groups on the same line (if enough space):</p>
  <div class="w3-show-inline-block">
  <div class="w3-bar">
    <button class="w3-bar-item w3-button w3-black">Button</button>
    <button class="w3-bar-item w3-button w3-teal">Button</button>
    <button class="w3-bar-item w3-button w3-red">Button</button>
  </div>
  </div>
  <div class="w3-show-inline-block">
  <div class="w3-bar">
    <button class="w3-bar-item w3-button w3-black">Button</button>
    <button class="w3-bar-item w3-button w3-teal">Button</button>
    <button class="w3-bar-item w3-button w3-red">Button</button>
  </div>
  </div>
</div>

</body>
</html>