This is a great animation that you can add on your website during Christmas time. In this animation, you can see falling snowflake to your website with a slight wind effect to it time to time. Designed by Nicky Christensen.
If you are having trouble with the pen, try the archived copy on GitHub
Pure CSS Snow Snippet
See the Pen CSS3 Snow Animation by Nicky Christensen (@NickyCDK) on CodePen.0