Simple pagination inside the hbox's endSlot will be correctly end-aligned and there is no need in custom styles.
For example:
<hbox classNames="buttons-panel">
<startSlot>
<button text="Button"/>
</startSlot>
<endSlot>
<button text="Button"/>
<simplePagination dataLoader="usersDl"/>
</endSlot>
</hbox>
AR:
ER:
