This presentation illustrates the simple use of style.
Use PageDown/PageUp or the arrow keys to move between slides.
The rules margin: 0; padding: 0; on the body get rid of unwanted
gaps round the edge of slides.
The rule margin: 0; on h2 headings pushes them to
the top of slides.
The rule margin: 0.6em 1em 0.6em 1em; on paragraphs specifies
desired gaps above, to the right, below, and to the left of paragraphs.
The rule font-size: 40px; increases the default size of text
throughout the presentation.
A useful convention is to reserve h1 for use in a title slide at
the start of a presentation, if any, and h2 for the heading at the
top of each slide.
The rule font-size: 200%; increases the size of text
in slide headings.
The rule text-align: center; centres the slide headings.
The rule background-color: #4af; is sufficient to make a
distinctive banner, with the colour being in hex RGB format.