PrimeNG Theming with SASS Compile Prerequisites sass, install with npm install -g sass Create a css Dark: sass --update themes/rortheme/dark/teal/theme.scss:themes/rortheme/result/theme-dark.css Light: sass --update themes/rortheme/light/teal/theme.scss:themes/rortheme/result/theme-light.css Documentation https://www.primefaces.org/designer/api/primeng/15.0.0/ Other references https://designer.primeng.org/#/