Fixed multiple bugs

【Contents of fix】
■Fixed a bug in which the carousel content on the top page was not centered when the number of displays was small.
■Fixed the bug that staff contents are not displayed on the “Staff Articles Page”.
■Fixed a bug that the Page no slider template of fixed pages displays a blank space on the right side of the page (Mac/Safari).

The following are the files that have been modified for this update.
【Modified file】
agent.css
single-staff.php
style.css