element-plus/docs/examples/input-number/size.vue

<template>
  <el-input-number v-model="num1" size="large" />
  <el-input-number v-model="num2" class="mx-4" />
  <el-input-number v-model="num3" size="small" />
</template>

<script lang="ts" setup>
import { ref } from 'vue'

const num1 = ref(1)
const num2 = ref(2)
const num3 = ref(3)
</script>