Thanks for the feedback! We are aware and will fix this soon.
To give you some context, for emails to appear properly in GMail, all styles must be created inline in the HTML elements. At the time we created the emails, this was not done.
The upcoming new 5.0 version of the Agile Platform will make all styles inline automatically for emails. We will shortly upgrade all our internal infrastructures for a pre-release of the new 5.0, and will therefore have this fixed automatically, without having to change all our emails.