Easy Themes for ProtonMail

A collection of CSS themes that's simple to edit the colors and more.

Dark Theme

Copy the CSS directly and edit the colors.

Flat Theme

Copy the CSS directly and edit the colors.

Background Image Theme

Copy the CSS directly and edit the image variable --image to your own image. Take a look at coolbackgrounds.io for awesome backgrounds.

GM Theme

Copy the CSS directly and edit the colors.

Customize

Take any theme above and you can override the theme colors with your own.

/* First paste the CSS theme. */
 
/* Now you can change the colors... */
:root {
    --theme1: #3652d1; /* Blue instead of Red */
}

And that's it!

CSS variables make it easy to override colors. The root keyword just means it will set the variables globally. These themes have been simplified down into 7 "core" colors that make it easy to overwrite any colors of your choice. So take one of the themes above and set the colors with your own. You can also generate a pretty color palette here.

:root {
/* Core Theme Colors */
    --theme1: #66669a; /* Purple */
    --theme2: #5f5f60; /* Dark Grey */
    --theme3: #f0f0f0; /* Light Grey */
    --theme4: #bcbdbf; /* Grey */
    --theme5: #797a7c; /* Medium Grey */
    --theme6: #9397cd; /* Light Purple */
    --theme7: #fefefe; /* White */
}

1. Copy a CSS theme.
2. Paste in ProtonMail. Settings > Appearance > Custom Theme.
3. Customize the colors (or leave default).
4. Enjoy!

Notes

• This is only available for the WEB version and not the MOBILE app.
• Some of these themes aren't always the best. If you have any problems you can open an issue here.
• If you're trying to use @import, the Content-Security-Policy (CSP) header blocks @import statements from loading remote content. To get around this, please copy and paste the entire contents of the CSS theme rather than the @import line.

Privacy and Performance

The above code used a CSS import statement for ease of use and quickly trying out a theme. However, the CSS import statement causes files to load sequentially instead of parallel, thus slowing down your pages load performance. Also, if your privacy is of the utmost importance, then I wouldn't use the CSS import statment from above. It potentially could reveal your behavior e.g. identifying when you load up ProtonMail using which specific theme. To avoid this, please copy & paste the entire contents of the CSS file, rather than use the import statement. This is no longer a concern, now that the Content-Security-Policy (CSP) Header blocks @import statements from loading remote content.

Contribute

Spot a problem or bug? You can open an issue here.

I'll accept pull requests to the master branch too. Please make sure to minify the CSS as well.

Share with friends

• Save, copy, tweak, and share any of this CSS theme.
• Licensed as MIT and free forever.