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代码编辑器：

<!DOCTYPE html>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://cdn.bootcss.com/foundation/5.5.3/css/foundation.min.css">
<script src="https://cdn.bootcss.com/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdn.bootcss.com/foundation/5.5.3/js/foundation.min.js"></script>
<script src="https://cdn.bootcss.com/foundation/5.5.3/js/vendor/modernizr.js"></script>
<form>
<div class="row">
  <h2>使用网格设置输入框大小</h2>
  <div class="large-10 medium-7 columns">
    <label>large-10 medium-7 (100% on small)
      <input type="text" placeholder="姓名">
    </label>
  </div>
</div>

<div class="row">
  <div class="small-5 columns">
    <label>small-5
      <input type="text" placeholder="姓名">
    </label>
  </div>
</div>

<div class="row">
  <div class="medium-3 columns">
    <label>medium-3 (100% on small)
      <input type="text" placeholder="姓名">
    </label>
  </div>
</div>

<div class="row">
  <div class="medium-4 columns">
    <label>medium-4 (100% on small, stacked)
      <input type="text" placeholder="姓名">
    </label>
  </div>

<div class="medium-4 columns">
    <label>medium-4 (100% on small, stacked)
      <input type="text" placeholder="姓名">
    </label>
  </div>

<div class="medium-4 columns">
    <label>medium-4 (100% on small, stacked)
      <input type="text" placeholder="姓名">
    </label>
  </div>
</div>
</form>

代码编辑器：

运行结果：