Fixed slug anomaly in project content

【Contents of fix】
■Fixed a bug where the slug of the project content was replaced without permission.
■Fixed a minor error that occurred in the TCD theme options screen.

The following are the files that have been modified for this update.
【Corrected files】
admin/theme-options.php
functions.php
style.css

For details, please see the download site for purchasers of MONOLITH (tcd042).