title: CSS: Shadow in a triangle
body: <p>I have this triangle in CSS:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>.triangle {
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 200px 200px 0 0;
    border-color: #007bff transparent transparent transparent;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="triangle"&gt;&lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>How can I apply a 1px shadow on the hypotenuse line?</p>