[Home](./index.md) > [kibana-plugin-plugins-expressions-server](./kibana-plugin-plugins-expressions-server.md) > [ExpressionFunctionDefinitions](./kibana-plugin-plugins-expressions-server.expressionfunctiondefinitions.md) > [theme](./kibana-plugin-plugins-expressions-server.expressionfunctiondefinitions.theme.md) ## ExpressionFunctionDefinitions.theme property Signature: ```typescript theme: ExpressionFunctionTheme; ```