I want to change the color of the blog post title within the post itself without changing the global header color.

Go to Settings > Content > Pages inside your HubSpot account and paste the following custom CSS into the Site header HTML field:

<style>
  .focus_blog_post-title { color: #00ff00; }
</style>

(Note: You can change the #00ff00 hex code to any color you prefer.)

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