Fixed minor errors/adjusted display

【Contents of the fix】
■Fixed a Notice error in the comment section of the post page.
■Fixed a Notice error in the new article submission screen.
■Adjusted the layout display of the Gutenberg editor (block editor).
■Adjusted the layout of the theme options management screen.

The following files have been modified for this update.
【Modified file】
admin/my_admin.css
functions.php
functions/seo.php
style.css