Multiple bug fixes

【Contents of the fix】
■Fixed an issue where categories were overlapping on the article details page when there was no eye catching setting.
■Fixed an issue where the font size of the top page and intro heading could not be changed.
■Optimized for Google Mobile Friendly Test.

The following are the files that have been modified for this update.
【Corrected files】
css/responsive.css
js/jscript_responsive.js
style.css

For details, please visit BRIDGE (tcd049) download site for purchasers.