Revert "move <style /> tag inside report.layout template to ease customization"

This reverts commit 5869f4391e1fac2b9dfc0c96d5573b27aab0b89a.
Revert "Revert "move <style /> tag inside report.layout template to ease customization""

This reverts commit baef333b475aa220708af1aa3809ddf0d98088c3.