We first need to install new themes.
pip install mkdocs-material
If you're using a modern version of mkdocs then you need the
following settings to achieve the same result:
site_name: My Docs
theme:
  name: material
  palette:
    primary: purple
    accent: cyan
  font:
    text: Ubuntu
  icon:
    logo: material/cloud
This is different than the file in the video because mkdocs-material
has gone through an update. The mkdocs.yml file in this video
contains the following code:
site_name: My Docs
theme:
  name: material
  palette:
    primary: purple
    accent: cyan
  font:
    text: Ubuntu
  logo:
    icon: cloud
Note that the color settings, font settings and icon settings can be reviewed in the documentation found here.