even if I add this to slider.php

<nav class="slides-pagination">
<a href='' class>1</a>
<a href='' class>2</a>
<a href='' class>3</a>
<a href='' class>4</a>
</nav>

or this

<nav class="slides-pagination">
<a href='' >1</a>
<a href='' >2</a>
<a href='' >3</a>
<a href='' >4</a>
</nav>