'is this menu button created by CSS or another thing

I m making my new website and I saw this amazing menu button in that

for more reference, u can directly visit the site on

i used developer tool but it not showing in animation

Does anyone recommend me where i can learn this type of CSS animation if it is CSS.

css svg-animate

Solution 1:^[1]

The Button is made with Three.js library. its impossible to make it with css

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Solution	Source
Solution 1	Kowalkox