<style>
  .primary {
    background-color: blue;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
  }

  .danger {
    background-color: red;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
  }

  .success {
    background-color: green;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
  }
</style>
<button class="primary">送信</button>
<button class="danger">削除</button>
<button class="success">保存</button>