Multiple bug fixes

【Contents of the fix】
■Fixed a bug in which the titles of the links to the articles before and after the press release details page would protrude when viewed from a smartphone.
■Fixed a bug in which the titles of the links to the articles before and after the announcement details page would protrude when viewed from a smartphone.
■Fixed to support SSL.

The following are the files that have been modified for this update.
【Modified file】
functions/update_notifier.php
single-news.php
single-press.php
sns_btn_btm.php
sns_btn_top.php
style.css

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