Dark theme for Ubuntu

ptillisch · November 21, 2025, 10:13am

For Arduino IDE 2.x, you install themes under a folder you create at the following path on your hard drive:

C:\Users\<username>\.arduinoIDE\plugins

However, that is only for additional themes you install. It appears you are using the built-in "Dark High Contrast" theme in Arduino IDE 2.x. The source of that theme is here:

github.com/eclipse-theia/theia

packages/monaco/data/monaco-themes/vscode/hc_black.json

v1.57.0

{
  "$schema": "vscode://schemas/color-theme",
  "name": "Dark High Contrast",
  "colors": {
    "editor.background": "#000000",
    "editor.foreground": "#FFFFFF",
    "editorIndentGuide.background": "#FFFFFF",
    "editorIndentGuide.activeBackground": "#FFFFFF",
    "sideBarTitle.foreground": "#FFFFFF",
    "selection.background": "#008000",
    "editor.selectionBackground": "#FFFFFF",
    "statusBarItem.remoteBackground": "#00000000",
    "ports.iconRunningProcessForeground": "#FFFFFF",
    "editorWhitespace.foreground": "#7c7c7c"
  },
  "tokenColors": [
    {
      "scope": [
        "meta.embedded",
        "source.groovy.embedded"

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A community member shared information on the Arduino IDE 2.x theme system here:

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Installing Black Theme in IDE 1.8.19 failed IDE 1.x	5	642	July 8, 2025
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Dark theme for Ubuntu

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