[fix] Fixed wrapping and overflow in Japanese, and adjusted font size at the smartphones.

[ShiMeiWo]

• Fixed a style setting that is considered "layout breakdown" in Japan.
  • Fixed a problem where the content area extends vertically due to wrapping at a single character.
  • Specified scroll direction explicitly.
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• Corrected the style sheet so that the font size of Japanese characters on the top page is not reduced.
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