I found the answer. Turn out I just need to make those contents I don't need the same color as background to hide them

@page {
    @top-center {
        content: '';
        color: transparent;
    }
    @bottom-right {
        content: '' counter(page) ' / ' counter(pages);
        margin-bottom: 15px;
        margin-right: 10px;
    }
}