<form>
  <style>
    li { list-style: none; }
    .btn {
      width: 80px;
      height: 30px;
      background-color: black;
      border-radius: 5px;
      color: white;
      line-height: 30px;
      text-align: center;
      cursor: pointer;
    }
  </style>
  <ul>
    <li><div class="btn">버튼</div></li>
  </ul>
</form>
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