Fixed multiple bugs

【Contents of the fix】
■Fixed a bug in the output of free space in the custom post “Staff”.
■Fixed an issue with RSS feed output when using Lazyload in the theme options speedup setting.
■Fixed a bug that the font type of the theme option is not applied to the default template of fixed pages.
■Style adjustments

The following files have been modified for this update.
【Modified file】
css/responsive.css
functions/acceleration.php
page-noside.php
page.php
single-staff.php
style.css