naive-ui/demo/documentation/components/input/enUS/size.demo.md

Size

<n-space vertical align="stretch">
  <n-input v-model:value="value" type="input" size="small" placeholder="Small Input"/>
  <n-input v-model:value="value" type="input" placeholder="Medium Input"/>
  <n-input v-model:value="value" type="input" size="large"  placeholder="Large Input"/>
</n-space>

export default {
  data () {
    return {
      value: null
    }
  }
}