Fixed multiple bugs

【Contents of the fix】
■Fixed a bug in the product page slider when displayed on a smartphone.
■Fixed to be able to open and close the submenu of the mega menu when viewed on a mobile phone.
■Fixed a problem with the official Twitter button not being displayed.

The following are the files that have been modified for this update.
【Corrected files】
・css/responsive.css
・js/jscript.js
・footer.php
・header.php
・style.css

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