Result Size: 625 x 664
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<!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">
<style>
.w3-btn {margin-bottom:10px;}
</style>
<body>
<div class="w3-container">
<h2>Button Borders</h2>
<p>
  <button class="w3-button w3-white w3-border">Button</button>
  <button class="w3-button w3-yellow w3-border">Button</button>
  <button class="w3-button w3-white w3-border w3-round-large">Button</button>
  <button class="w3-button w3-white w3-border w3-border-red w3-round-large">Button</button>
</p>
<p>
  <button class="w3-btn w3-white w3-border">Button</button>
  <button class="w3-btn w3-yellow w3-border">Button</button>
  <button class="w3-btn w3-white w3-border w3-round-large">Button</button>
  <button class="w3-btn w3-white w3-border w3-border-red w3-round-large">Button</button>
</p>
</div>
</body>
</html>