You can easily adapt SIGN8 to your own design. You can find the whitelabelling in the administration area under the following link.
Whitelabeling Website #
Here you can change the primary colour and the logo. Changes are visible in the SIGN8 app as well as on the signing page.
Whitelabeling E-Mail #
Similar to the website, you can also adapt the emails to your design. Here you can also add your own logo and set the colour.
By default, the e-mails are sent by SIGN8. However, you can also use your own mail server. For this we need the SMTP settings of your mail server.