Changing Jupyter Lab Syntax Colors #

To change the syntax colors in JupyterLab installed via pip, you need to locate the default themes and the index.css file. These files are typically found in ~/.local/share/jupyter/lab/themes if installed at the user level, or in /usr/share/ if installed system-wide. The colors are defined in the index.css files, specifically within the block for CodeMirror styles, which includes variables like --jp-mirror-editor-keyword-color for keywords and --jp-mirror-editor-string-color for strings

For example, to change the color of the “import” keyword, you would modify the --jp-mirror-editor-keyword-color variable. You can find the specific path by running jupyter --paths and checking the directories under data

If you do not have these folders, it might be because JupyterLab installed via pip does not automatically create them. In such cases, you can manually create the necessary directories and files to customize the theme

custom theme #

the default themes rest @ ~/.local/share/jupyter/lab/themes if installed at user level.

link

my theme #

~/.local/share/jupyter/lab/themes/@jupyterlab/theme-dark-extension$

/* Defaults use Material Design specification */
/* my custom colors */
/* --my-main-color:#D1B498; */
--my-main-color:#D6C8BC;
--jp-content-font-color0: var(--my-main-color);
--jp-content-font-color1: var(--my-main-color);
--jp-content-font-color2: var(--my-main-color);
--jp-content-font-color3: var(--my-main-color);

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/* Code mirror specific styles */
/* my custom colors */
/* bright purple color hex #AA22FF */
--jp-mirror-editor-keyword-color: #C37D3B;
--jp-mirror-editor-atom-color: #E7A0E9 ;
--jp-mirror-editor-number-color: #89FFDC;
--jp-mirror-editor-def-color: #C37D3B;
--jp-mirror-editor-variable-color:#51D4FF;
--jp-mirror-editor-variable-2-color:#51D4FF;
--jp-mirror-editor-variable-3-color: #51D4FF;
--jp-mirror-editor-punctuation-color:  #51D4FF;
--jp-mirror-editor-property-color:#EBA22C;
--jp-mirror-editor-operator-color: #C0A57A;
--jp-mirror-editor-comment-color: #584E4C;
--jp-mirror-editor-string-color: #DCADF0;
--jp-mirror-editor-string-2-color:#B656DF;
--jp-mirror-editor-meta-color: #a2f;
--jp-mirror-editor-qualifier-color: #AA22FF;
--jp-mirror-editor-builtin-color: #83D0E9;
--jp-mirror-editor-bracket-color: #997;
--jp-mirror-editor-tag-color: var(--md-green-700, #388e3c);
--jp-mirror-editor-attribute-color:#AA22FF;
--jp-mirror-editor-header-color:#AA22FF;
--jp-mirror-editor-quote-color: #AA22FF;
--jp-mirror-editor-link-color:#AA22FF;
--jp-mirror-editor-error-color:#AA22FF;
--jp-mirror-editor-hr-color: #AA22FF;