Mailchimp form

Sorry Leo. Check it now please!

Try this CSS:

.sidebar .mc4wp-form input[type="submit"] {
    width: 100%;
}
.entry-content .mc4wp-form input[type="submit"] {
    width: 275px;
}
.mc4wp-form input[type="text"], .mc4wp-form input[type="email"] {
    background-color: #303030;
}

Adding CSS: https://docs.generatepress.com/article/adding-css/

You'd need to check with MailChimp's support to see how to add custom text below the form.

It works perfect for submit button and background color.
Now, I need :
- Add text (simple sentence) below the submit button. (We never share your information with third parties and will protect it in accordance with our Privacy Policy)
- (Privacy Policy) is clikable.

Now, I need :
– Add text (simple sentence) below the submit button. (We never share your information with third parties and will protect it in accordance with our Privacy Policy)
– (Privacy Policy) is clikable.

I actually answered this above:
https://generatepress.com/forums/topic/mailchimp-form/page/2/#post-1261878

You'd need to check with MailChimp's support team for those requests as the theme doesn't control that.

Finally Leo.
How can I do that (submit button size - background form color) for Mailchimp subscribe form which I've put it"s shortcode in a text page or post by Gutenberg Classic block?

Where can I see the form you are referring to?

I've put the link in the orginal message. Please, check it!

Edit the CSS here so it should do both:
https://generatepress.com/forums/topic/mailchimp-form/page/2/#post-1261878

There is a problem about the form inside the post, I can't adjust width of submit button and color of one field.

Try the CSS above again:
https://generatepress.com/forums/topic/mailchimp-form/page/2/#post-1261878

Adjust the 275px; for the button width in the post content.

It works perfect. Thanks Leo.

No problem :)