Is possible to add falldown snow on theme in site?
samone can help to add?

Hello,
You can use JavaScript Snow: DHTML Snowstorm. Making it snow on the internets since 2003.


Or this one.

Minimalist Falling Snow Effect with Pure JavaScript - Snow.js | CSS Script

Just another pure JavaScript implementation of simple snowfall effect that uses pure HTML/CSS for snowflakes.

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You may need some knowledge of Javascript to customise it.