For the same reason, I also separated the source code, which was modified only to bypass the load crash, into a separate site: https://iphonefineclass.mangoedu.co.kr Only CSS lazy loading is applied, and the rest of the source code is identical.

Correction: 360KB -> 640KB

For reference, after deleting the section, the file size of estreUi.css was 59,470 bytes, compared to the original size of 360,468 bytes.

In the first case, I uncommented the link to the estreUi.css file and tested it by removing the code directly from that file. Removing all code from line 1195 onward allowed the file to load normally. I also tested to see if the issue was caused by that line, a specific point, or a specific block, but it didn't seem to be related to any specific content, and it seems to be simply a problem with the code volume. Please consider this and resolve the issue.

Correction: Request Mobile Website -> Request Desktop Website