How can I add custom CSS styling to my GitHub README.md file?

Customizing the Readme.md File with CSS in GitHub Repos

In GitHub repositories, users often encounter difficulty in identifying the CSS file that governs the styling of the readme.md file at the repository's root. The standard assumption is that the .github/github.css file serves this purpose, but attempts to modify this file typically yield no visible changes to the markdown.

In actuality, GitHub repos do not provide direct support for custom CSS files that control readme.md files. As an alternative, one can leverage an ingenious workaround involving HTML, CSS, and SVG.

To implement custom CSS, follow these steps:

1. Create an SVG File: Create an empty SVG file.
2. Include HTML and CSS: Inside the SVG file, embed the desired HTML and CSS content within a tag.
3. Embed SVG in Readme.md: In the GitHub README, embed the SVG file using an tag.

For instance, to alter the color of the h1 text using CSS, create a file named "custom.svg" with the following content:

<code class="svg"><svg width="0" height="0">
  <foreignObject width="100%" height="100%">
    <style>
      h1 {
        color: red;
        animation: myanimation 2s infinite;
      }

      @keyframes myanimation {
        from {
          color: red;
        }
        to {
          color: yellow;
        }
      }
    </style>
    <h1>Hello world!</h1>
  </foreignObject>
</svg></code>

In the readme.md file, embed the SVG using:

<code class="markdown"><img src="custom.svg"></code>

This workaround effectively allows for the inclusion of custom CSS and animation within the readme.md file, enabling users to personalize the appearance and interactivity of their GitHub repositories.

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