The text color of the main toolbar button does not match the theme color

Hi, guys,
I have a plugin can adds buttons to the main toolbar. When i enabled new UI and switch the theme to Light, the text color of the buttons changes to black, but the color of main toolbar is dark, i can not see the text. The adjacent Gradle plugin works fine.
I've tried other themes and only the light theme has this problem.
The Plugin's home page at https://plugins.jetbrains.com/plugin/23003-open-url
The Plugin's source code at https://github.com/GuJin/OpenURL ,
The source code of the button is https://github.com/GuJin/OpenURL/blob/master/src/main/kotlin/tech/gujin/ideaplugin/openurl/action/DynamicButtonAction.kt
How can i solve this problem? Thank you very mach.