Margins in Email Templates

Your software
My Mautic version is: v5.16.0
My PHP version is:
My Database type and version is:

Your problem
My problem is: I am building an email using the blank template and the margins on the right are enormous. The preview is formatted correctly, but when it is delivered the right margin is in the middle of the screen. Any ideas?

These errors are showing in the log:

Steps I have tried to fix the problem: