Use the available blocks. Use the open forms theme as your base theme, or copy the css to you theme.
https://github.com/henriquefps/open-forms/blob/main/customization.md
https://github.com/henriquefps/open-forms/blob/main/renderer-translations.json
https://github.com/henriquefps/open-forms/blob/main/builder-translations.json
https://github.com/henriquefps/open-forms/blob/main/SCHEMA_REFERENCE.md
1.0.0 is missing mapping the translation inputs on blocks
read limitations on GitHub
For more information on how to use each input of the block, check out the integration guide.https://github.com/henriquefps/open-forms/blob/main/INTEGRATION_GUIDE.md