CSS Not Loaded in QWeb Reports

In case the CSS​ is not loaded in the QWeb Reports, few System Parameters​ that may solve the issue are following:

• The system parameter web.base.url​ ​need to have as value the system's domain, in our case that is  https://odoomastery.com​
• The parameter web.base.url.freeze​ need to have as value True​
• The parameter report.url​ need to have as value the system's local host url, in many cases that would be http://localhost:8069​

The System Parameters​ menu can be found at:
Settings >> Technical >> Parameters >> System Parameters​.