<style>
  .btn {
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
  }

  .primary {
    color: white;
    background-color: blue;
  }

  .danger {
    color: white;
    background-color: red;
  }

  .success {
    color: white;
    background-color: green;
  }
</style>
<button class="btn">リセット</button>
<button class="btn primary">送信</button>
<button class="btn danger">削除</button>
<button class="btn success">保存</button>