Theming
Keycloak
Keycloak offers the most control over what can be customized, from the login page to the administration and user dashboards. SSO Kit offers a custom theme for Keycloak based on Lumo. It gives the provider’s login page a look and feel similar to what a Vaadin developer would experience using the Login component.
Installation
To use the Keycloak Lumo theme, you need to do a few things:
-
First, download the
sso-kit-keycloak-lumo
JAR file from Maven. -
Next, copy the JAR file into the
/providers
directory of your Keycloak installation.
Once you’ve done that, you can either set the theme for all or some clients in a realm.
-
To set the theme for all clients, go to "Realm settings", "Themes". At the "Login theme" selector, choose
sso-kit-keycloak-lumo
. -
To set the theme on a specific client, go to "Clients" and find the client. At the "Login settings" section, select
sso-kit-keycloak-lumo
as the "Login theme".
Customizing the Lumo Theme
You can also customize the Lumo theme to suit your application’s branding. To customize the theme, you need to do a couple of things:
-
Create this directory structure under the
/themes
directory of your Keycloak installation:themes/ └── your-theme/ ├── resources/css/ │ └── my-theme-styles.css └── themes.properties
-
In
themes.properties
, you need to define some properties such as the parent theme, and load the CSS files:# Specify the parent theme parent=sso-kit-keycloak-lumo # Need also to load the files from the parent theme styles=css/lumo-common.css css/lumo-styles.css css/my-theme-styles.css
-
Next, in
my-theme-styles.css
you can add your styles. For example, you might change the primary color to suit your application’s branding.html { --lumo-primary-color: rgb(22, 138, 72); --lumo-primary-color-50pct: rgba(22, 138, 72, 0.704); }
While working on a custom theme, you might want to disable Keycloak theme caching. You would do that like this:
./bin/kc.bat start-dev --spi-theme-static-max-age=-1 --spi-theme-cache-themes=false --spi-theme-cache-templates=false
For more instructions, see the official Keycloak theme documentation.