[Reference CSS Styles](https://www.tutorialrepublic.com/css-tutorial/)

## Style Groups

> checked = group exists  
> sublist = additional missing properties

- [x] text
- [x] background
  - gradients
- [x] box
- [x] flexbox
- [x] flex item (child of flexbox)
- [x] grid
- [x] grid item (child of grid)

## Advanced Styling

- [ ] Animations
- [ ] Sprites
- [ ] Filters
- [ ] Media Queries
