CSS

CSS stands for Cascading Style Sheets.

It is a simple mechanism for adding style (e.g., fonts, colours, spacing) to web pages.

CSS sample code

<!DOCTYPE html>
<html>
  <head>
    <style>
      h1 {
        color: blue;
      }
      p {
        font-size: 18px;
      }
    </style>
  </head>
  <body>
    <h1>My CSS heading</h1>
    <p>This is a paragraph.</p>
  </body>
</html>