Multiple revisions

【Contents of fixes】
■Fixed to support PHP7.
■Fixed the display of the PAGE TOP button.

The following are the files that have been modified for this update.
【Corrected files】
widget/ad.php
widget/archive_list.php
widget/category_list.php
widget/custom_menu.php
widget/google_search.php
widget/styled_post_list1.php
widget/styled_post_list1_bk.php
footer.php
style.css

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