You can add style for each element that you want to styling.

the other option is -> there is 3 div class for report: header, page / article, then footer, you need to put style tag inside of them.

example:

<div class="header">

<style>

<!-- add your style here -->

</style>

<!-- your other elements -->

</div>

<div class="page">

<style>

<!-- add your style here -->

</style>

<!-- your other elements -->

</div>