Right way to customize login page and others things

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You might want to read this, which I think fits what you are looking to do, but just realize it is meant for sub-categories

How to display sub-categories in boxes

There are two new ways to display a list of sub-categories within the parent category: in boxes with only the name, logo, and description in boxes with name, logo, and a list of some featured topics You can enable these styles by visiting the parent category, editing its settings, going to the settings tab, and choosing these options: [37%20PM] Boxes The “Boxes” style is currently being used in our howto category. By using very short category description and adding logos to each subcatego…