Blocks are self contained structural elements in Gantry 5 that can be particles, positions or spacers. They have several controls, such as sizing, but also allow you to select from a dropdown list of variations, as well as insert your own CSS classes.
Basic Box Variations
Box 1
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A collection of additional variations for structural and subtle stylistic adjustments.
Effects and classes should be applied to the block within the Layout Manager, rather than in the widget parameters, to ensure the desired effect is achieved.