All the following are created using CSS and JavaScript only (no images or SVG)

Candles

See the Pen The annoying candle by Chris McNally (@chrismcnally) on CodePen.

Go ahead, drag the one on the right

See the Pen Newtons cradle -fork by Chris McNally (@chrismcnally) on CodePen.

Day into night

See the Pen Night and day by Chris McNally (@chrismcnally) on CodePen.

Bright Idea

See the Pen Bright idea by Chris McNally (@chrismcnally) on CodePen.