How to change the color (foreground and background) of paired parentheses?
1）在用户文件夹修改 custom.css 文件无效。
（The modification of the custom.css file in the user folder is ineffective）
2）已经建立了一个jupyter_lab_config.py,包含：c.LabApp.custom_css = True
（ A jupyter_lab_config.py has been set up, containing: c.LabApp.custom_css = True ."）
3）启动jupyter lab成功，但是配对括号的颜色还是与原来一样：颜色很深，在黑色背景下很不明显。
（Jupyter Lab launches successfully, but the paired brackets still have the same deep color, which is not very visible against the black background.）
Not sure if this is helpful, but maybe: GitHub - krassowski/jupyterlab-rainbow-brackets: Rainbow parentheses and rainbow brackets in JupyterLab
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Also see
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非常感谢！还是您的jupyterlab-rainbow-brackets更好！我已安装成功！
Thanks a lot!