为啥elemen-UI的input控件会独占一行该怎么解决？

如图，input框独占一行，但是不能调整他的长度

<template>
    <div>
        <el-input placeholder="ID" v-model="ID" clearable></el-input><!-- ID -->
        <el-input placeholder="药名" v-model="Name" clearable></el-input><!-- 药名 -->
        <el-input placeholder="来源" v-model="Source" clearable></el-input><br><!-- 来源 -->
        <el-input placeholder="药性" v-model="Characteristic" clearable></el-input><!-- 药性 -->
        <el-input placeholder="功能主治" v-model="FunctionalIndications" clearable></el-input><!-- 功能主治 -->
        <el-button type="primary" icon="el-icon-search">查询</el-button>
    </div>
</template>


<script>
  export default {
    data() {
      return {
        ID: '',
        Name:'',
        Source:'',
        Characteristic:'',
        FunctionalIndications:''
      }
    }
  }
</script>

<style>
.el-input{
  width: 200px;
  padding: 2mm;
}
.el-button{
  height: 50;
  width: 200;
  padding: 15;
}
</style>

可以用布局，把input组件放进去

<el-row>
<el-col></el-col>
</el-row>

具体参考官网

如果非要用传统css控制宽度，不如用div先包裹每个el元素，控制div的宽度