This was a short but notion fulfilling chapter.

We moved through the viewport notion on how to actually measure responsive objects with the viewport width and height measures.

These were also useful for the real, responsive vertical centring of your website sections.

As a final topic, you were introduced to and began using the calc() CSS property, which puts basic math under a useful web designer light.

In the next chapter, we will examine how pre-processors can handle some of our CSS faster, especially for typography. See you there!