Advanced Customization


App Twine allows advanced customization its interface by creating a special file, user.css, in your Twine folder. You'll need to create this file outside of Twine using a text editor.

If user.css exists, then app Twine will add the contents of it to the UI as CSS rules, potentially overriding the default styling. CSS allows changing the appearance of the application--using different fonts, for example, or colors--but does not allow changing Twine's functionality or adding new features.

Here's a sample user.css that replaces the graph paper background of the story map with a plain gray color:

.passage-map {
  background: hsl(0, 0%, 75%) !important;

[data-app-theme="dark"] .passage-map {
  background: hsl(0, 0%, 30%) !important;

user.css is only available in app Twine. If you'd like to customize browser Twine using CSS, browser extensions like Stylus might help.

Some important things to keep in mind working with user.css:

  • The structure of Twine's UI can and will change on every release, even for patch-level version changes. Because these changes are often numerous, they will not be part of release notes.
  • The file must named exactly user.css--all lowercase. User.css will not work.
  • Changes to user.css will take effect the next time you start Twine.
  • To determine what CSS selectors to use, you can either use developer tools in browser Twine--the DOM structure is identical between browser Twine and app Twine--or open developer tools in Twine itself by going to Troubleshooting under the Help menu, then choosing Show Debug Console.
  • You can use the in-app debug console to test your CSS rules. The rules you set in user.css will be listed as injected stylesheet in the developer console.
  • user.css must be at the same folder level as your Stories and Backups folders, directly below the Twine folder.
  • If there's a problem loading user.css, Twine will load as normal and not apply any customizations. If any of your CSS rules are incorrectly written, they will be ignored. Twine will not show a warning in any of these cases.
  • In order for user.css to win specificity, you might need to add !important to the end of your declarations.