This theme directly extends the Magento 2 Blank theme but implements the font icon set from the Luma theme.
The package includes CSS adjustments to scale font sizes in keeping with the Luma icons (which represent a size more typical of available icon fonts). The theme is intended to serve as a base for extending with your own theme and replacing icons with your own.
After obtaining the file package, extract the contents into app/design/frontend/chrisnanninga/luma-icons, then run the following.
bin/magento cache:flushcomposer config repositories.chrisnanninga/luma-icons git [email protected]:CNanninga/theme-frontend-luma-icons.git
composer require chrisnanninga/theme-frontend-luma-icons:^1.0
bin/magento cache:flush