You can modify the headline and description in the content.js file.
src/app/resources/content.js
const newsletter = {
display: true,
title: <>Subscribe to {person.firstName}'s Newsletter</>,
description: (
<>
I occasionally write about design, technology, and share thoughts on the intersection of creativity and engineering.
</>
),
};
Background effect
There's a pre-configured background in Mailchimp.tsx that you can modify in the mailchimp object. Set graphic elements such as gradient, dots, lines, and grid and configure their appearance for the newsletter block.