Fixed a display bug/style adjustment on iPhone

■Adjusted the style of the top and bottom arrows of the top page scrolling content.
■【iPhone】Fixed a bug that the Hatena bookmark icon is not displayed in the share button of the fixed footer bar.
■Adjusted the layout in the theme options management screen.

The following files have been modified for this update.

【Modified files】
footer-bar/footer-bar.css
footer-bar/footer-bar.php
functions/update_notifier.php
languages/ja.mo
languages/ja.po
style.css
widget/google_search.php

【Added files】
img/common/hatenabookmark-logomark.svg

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