Content blocks, made in Drag & Drop editor, have a smaller width then the email templates

Hi everybody!

I was wondering, do other people also encounter the issue that the content blocks, made with the drag & drop editor, that they put in an email and have the same width as the email (600px), are being rendered smaller compared to the mail. I have checked the padding within the content block and the padding within the email itself but everything is set to 0, so I'm at a bit of a loss what to do. It creates issues for the content block that we use as a header as it doesn't line up with the usual content within the mail.