Adding classes to inputs and labels in Umbraco Forms

There is a heading and text field type for info blurb

And forms support columns.. (at least form groups do )

The last level of structure are columns that can be created within a group.
To set the number of columns, click the cog icon next to the Group Name.
You can now add or move fields to the new columns created.

Creating a Form - The basics | Umbraco Forms