# @itwin/itwinui-variables ## Installation ```console npm install @itwin/itwinui-variables ``` ## Usage Import in CSS: ```css @import '@itwin/itwinui-variables'; ``` Or in JS (if using a bundler): ```js import '@itwin/itwinui-variables'; ``` > **Note**: If your project doesn't support export maps, then you might need to import the css file explicitly: > > ```css > @import '@itwin/itwinui-variables/index.css'; > ``` Specify a theme ("light" or "dark") by adding a `data-iui-theme` attribute to the top of your app. ```html ``` Now you can start using the variables: ```css button { background-color: var(--iui-color-background); border: var(--iui-color-border); color: var(--iui-color-text); } ``` You can also specify `data-iui-contrast` to switch to a high contrast version of the current theme. ```html ``` If you want the variables to automatically respect the user preferences (`prefers-color-scheme` and `prefers-contrast`), then you need to additionally import `os.css`, and use `data-iui-theme` without a value. For example: ```css @import '@itwin/itwinui-variables'; @import '@itwin/itwinui-variables/os.css'; ``` ```html ```