How to set Boxed Content on a flushed section?
First, make sure you have set up the LoginSecure Framework to work with Gantry 5. You can view a video about this here(https://www.youtube.com/watch?v=04ZfeHtkQ0c).
Secondly, follow the below instructions to apply boxed content on a flushed section.
- Open any Gantry 5 theme.
 - Go to the layout tab.
 - Open the Section Settings.
 - Fill in by the input CSS Classes.
 - The name: force-boxed-content
 - Click "Apply and Save"
 - Open any Particle Settings inside the section.
 - Go to the Block tab.
 - Fill in by the input CSS Classes.
 - The name: force-boxed-content
 - Click "Apply and Save"
 
KB Article: https://loginsecure.eu/helpdesk/knowledgebase/view-article/53-how-to-set-boxed-content-on-a-flushed-section