This is a professional tool to manipulate enqueued Styles and Scripts on your website; add custom CSS to the first screen and not first screen optionally, choose where to apply. Use it to improve your Core Web Vitals score or just add custom styling.

• Control your website's CSS
• Apply changes to individual posts/pages/custom post types
• Apply changes to all posts of a specific type
• Apply changes to the blog or any post-type archive
• Inline, defer, or de-register / disable Styles and Scripts
• Edit CSS easily with the CodeMirror visual editor
• Automatic CSS minification
• Instructions to get CSS

firmcatalyst.com/first-screen-css

• Install and activate the plugin.
• Navigate to "CSS Settings" in the left sidebar of your wp-admin.
• Click "Add New"
• Input your CSS or adjust the settings.
• Choose where to apply the changes and Publish.
• Repeat to apply a different set of settings to other posts.