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The mistake many Divi users make is to add a background color to the modules within their row, rather than adding the background color to the columns within the row itself. To equalize your Divi columns you need to set the background color on the row columns and not on the modules within the columns. As the name suggest the equalize column heights does just that, rather than equalizing the modules that sit within the columns.
Activating the equalize column heights in your row setting may however not have the expected results as it only makes the columns equal heights and not the modules within those columns.

The mistake many Divi users make is to add a background color to the modules within their row, rather than adding the background color to the columns within the row itself. To equalize your Divi columns you need to set the background color on the row columns and not on the modules within the columns. As the name suggest the equalize column heights does just that, rather than equalizing the modules that sit within the columns.