Fixed minor errors/adjusted display/SSL support

【Contents of the fix】
■Fixed a Notice error in the new article submission screen.
■Adjusted the layout of the Gutenberg editor (block editor).
■Adjusted the layout of the theme options management screen.
■SSL support

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

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