Here is a small HTML code snippet with CSS that you can use to create a blog news section and showcase three social media marketing trends: html Blog News

Blog Post 1

Lorem ipsum dolor sit amet, consectetur adipiscing elit.

Blog Post 2

Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.

Blog Post 3

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore.

Trend 1

Lorem ipsum dolor sit amet, consectetur adipiscing elit.

Trend 2

Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.

Trend 3

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore.

This code creates a blog news section with three blog posts and a social media marketing trends section with three trends. The CSS styles the sections and items with borders, padding, and font sizes to make them visually appealing. Feel free to modify the HTML and CSS code to suit your needs and add more content as required. Remember to include relevant keywords in your content for better reach and visibility. Please note that this is a plain text representation of the HTML code. To see the interactive CSS and JS effects, you can copy and paste the code into an HTML file and open it in a web browser. Let me know if there's anything else I can help you with!