CSS Custom Properties spacer is not working on StyleBook

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.3.5 CE GA6, 7.3.10 DXP GA1, 7.3.X, Master
• Component/s: Liferay Themes > Classic
• Labels: None
• Branch Version/s:
  7.3.x
• Backported to Branch:
  Committed
• Fix Priority: 3

Steps to reproduce:

• Product Menu > Design > Style Book
• Create a New Style-Book
• Go to the Spacing category on the right-sidebar
• Change the Spacer

Expected results:

The white spaces in the page change

Current results:

The white spaces in the page don't change