Fixed a bug in the display of buttons on the top page scrolling content and a bug in the global menu for smartphones

【Contents of the fix】
■Fixed a bug where the buttons on the top page scrolling contents were not displayed.
■Fixed the bug that the submenu of the global menu becomes white background on smartphones.

The following are the files that have been modified for this update.
【Corrected files】
front-page.php
responsive.css
style.css

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