Best experience for the user when loading up an iframe

We're integrating our app into the Salesforce platform. For now, for this first version, we are simply loading up an iframe into Salesforce.

From a UX standpoint, would it be better to:

A. Style the iframe like the platform so it looks native to Salesforce, but still incorporate our logo in there

B. Style the iframe with respect to our brand. Meaning, this could look entirely different from Salesforce