@patternfly/react-core/src/layouts/Flex/examples/flex.css

This library provides a set of common React components for use with the PatternFly reference implementation.

.ws-react-l-flex .pf-v5-l-flex {
  padding: 1rem;
}

.ws-react-l-flex .pf-v5-l-flex > div,
.ws-react-l-flex .example-border {
  border-style: dashed;
  border-width: 2px;
  padding: 1rem;
}