Add transition to hovering over icons
Add transition to hovering over icons

Hovering over icons applied opacity instantly. Include a transition time
to create an animation effect.

Signed-off-by: Kien Ha <3e36ebd6a7c89ee7d9a20a5fbbffc571f107e566@gmail.com>

kien-ha/kien-ha.github.io,kien-ha/kien-ha.github.io