Gridbox is a clean and solid WordPress theme featuring a three-column grid-layout for posts. The theme works out of the box and does not require any complicated setup. It is perfectly suited for a simple magazine, blog or portfolio website. Gridbox is a clean and solid WordPress theme featuring a three-column grid-layout for posts. The theme works out of the box and does not require any complicated setup. It is perfectly suited for a simple magazine, blog or portfolio website.