帖子详情页面，按钮样式问题？

帖子详情页面，按钮部分代码

@can('update', $topic)
    <div class="operate">
        <hr>
        <a href="{{ route('topics.edit', $topic->id) }}" class="btn btn-default btn-xs" role="button">
            <i class="glyphicon glyphicon-edit">编辑</i>
        </a>

        <form action="{{ route('topics.destroy', $topic->id) }}" method="post">
            {{ csrf_field() }}
            {{ method_field('DELETE') }}
            <button type="submit" class="btn btn-default btn-xs pull-left" style="margin-left: 6px">
                <i class="glyphicon glyphicon-trash"></i>
                删除
            </button>
        </form>

    </div>
@endcan

页面展示效果：