Fixed a bug in the page builder

【Contents of the fix】
■Fixed a bug in which the pull-down menu did not work in the visual mode of the text editor when using Page Builder.

The files that have been modified for this update are as follows.
【Corrected files】
pagebuilder/assets/admin/css/admin.css
style.css

For more information, please visit the SOURCE (tcd045) download site for purchasers.