pnpm add -D @unocss/preset-rem-to-px

yarn add -D @unocss/preset-rem-to-px

npm install -D @unocss/preset-rem-to-px

bun add -D @unocss/preset-rem-to-px

import presetRemToPx from '@unocss/preset-rem-to-px'
import { defineConfig } from 'unocss'

export default defineConfig({
  presets: [
    presetRemToPx(),
    // ...other presets
  ],
})

<div class="m-2"></div>

.m-2 {
  margin: 0.5rem;
}

.m-2 {
  margin: 8px;
}