Use modules folder

modules/fcitx5/theme.conf

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+[Metadata]
+ScaleWithDPI=True
+
+[InputPanel]
+Font=Sans 13
+NormalColor=@fg0@
+HighlightCandidateColor=@fg1@;
+HighlightColor=@undefined@
+HighlightBackgroundColor=@undefined@
+Spacing=3
+
+[InputPanel/TextMargin]
+Left=10
+Right=10
+Top=6
+Bottom=6
+
+[InputPanel/Background]
+Color=@background@
+
+[InputPanel/Background/Margin]
+Left=2
+Right=2
+Top=2
+Bottom=2
+
+[InputPanel/Highlight]
+Color=@highlight@
+
+[InputPanel/Highlight/Margin]
+Left=10
+Right=10
+Top=7
+Bottom=7
+
+[Menu]
+Font=Sans 10
+NormalColor=@fg0@
+Spacing=3
+
+[Menu/Background]
+Color=@background@
+
+[Menu/Background/Margin]
+Left=2
+Right=2
+Top=2
+Bottom=2
+
+[Menu/ContentMargin]
+Left=2
+Right=2
+Top=2
+Bottom=2
+
+[Menu/Highlight]
+Color=@highlight@
+
+[Menu/Highlight/Margin]
+Left=10
+Right=10
+Top=5
+Bottom=5
+
+[Menu/Separator]
+Color=@highlight@
+
+[Menu/CheckBox]
+Image=radio.png
+
+[Menu/SubMenu]
+Image=arrow.png
+
+[Menu/TextMargin]
+Left=5
+Right=5
+Top=5
+Bottom=5