What does Pinterest uses for CSS?

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I'm currently cloning Pinterest's website with React and styled-components to study. But I'm intrigued with what they use for CSS, since each class name is reused a bunch of times. For an example:

<div class="Jea gjz xcv L4E zI7 iyn Hsu" />

CSS:

.gjz {
  align-items: center;
},

.Jea{
  display: flex;
  flex-direction: row;
}

Both classes seem to be auto-generated and are reused throughout the whole site. Is there a specific CSS framework that does that, or is this plain CSS with something else?

reactjs css
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