Servoy offers a layered mechanism of styling the UI of solutions.
OS Level
Smart Client Look and Feel with optional Themes, depending on the Look and Feel
Web Client Default StyleSheet
Servoy StyleSheets within the solution
Object properties
OS level >>
>> SC: LAF > CSS > Property > Scripting
>> WC: Default StyleSheet > CSS > Property > Scripting (optionally: Templating)
Supported CSS
Web Client Templating
onRender event