If you check the Hyvä theme for the first time, you will find Hyvä/reset and Hyvä/default themes present there. These themes have a similar relationship as between Magento/blank and Magento/luma. Thus, the Hyvä/rest theme is a base theme without any parent theme and a parent theme for Hyvä/default.
At the same instant, the Hyvä/reset theme and the blank theme of Magento are of different purposes. Hyvä theme can remove Magento’s LessCSS styles to implement a Tailwind CSS-based environment. Apart from this, it can also remove all blocks that Magento’s modules place in the base page layouts as well as frontend asset files, including JS and CSS.
Consequently, Hyvä/reset dramatically reduces the complexity of an average Magento page. It ultimately leads to a useless website, while Magento/blank creates a fully-functional storefront. At this instant, the Hyvä/default theme hits the stage. It rebuilds the entire Magento 2 frontend experience page by page and recreates new blocks and templates. Thus, Hyvä gives you a new approach to Magento’s front end. Although it incorporates a modern technology stack, the theme perfectly suits the system’s application architecture.