Implemented this checkbox function, there may still be bugs, but overall it works
I may only add new songs in the future, after all, this project was not developed by me. I only made some modifications to it and implemented some custom functions

Add the function of customizing background colors, but I am currently unable to use a checkbox to achieve the use of custom background colors or default background colors. Therefore, if you prefer the previous version, please manually roll back

add new song ETERNAL FLAME 〜空の箱〜
添加新曲 ETERNAL FLAME 〜空の箱〜

Added the function of changing image size, but cannot change the height of the spectrum, only allowing the width to adapt:（

添加了更改图片大小的功能，但不能改变频谱的高度,只能让宽度适配 :(

画像のサイズを変更する機能が追加されましたが、スペクトルの高さを変更することはできず、幅を合わせるしかありません:（

그림 크기를 변경하는 기능이 추가되었지만 스펙트럼의 높이는 변경할 수 없으며 폭만 조정할 수 있습니다:(