Fix for a grid issue

The homepage grid don't clear floating block after a "new line" ("last"
item + next item).
It's create a break in the grid, in Firefox and some version of Chrome
browsers.

Sorry for the  **components.css completion**, it's from my tool setting (auto-prefixer), but **you can keep the _grid.scss only** ;)
use the outputted `components.css` from the build process here instead