Fixed bugs / Added functions

【Contents of correction】
■Fixed a bug that the size of the margin below the slider on the top page may change when viewed on a smartphone.
■Added custom script function.

The following files have been modified for this update.
【Fixed files】
admin/inc/basic.php
admin/theme-options.php
functions/head.php
js/front-page.js
languages/ja.mo
languages/ja.po
style.css