put into commandline tool:
java -cp "./lib/*" com.vaadin.sass.SassCompiler ./scss/styles.scss ./VAADIN/themes/osbp/styles.css
java -cp "./lib/*" com.vaadin.sass.SassCompiler ./scss/styles-tea.scss ./VAADIN/themes/osbp-tea/styles.css
java -cp "./lib/*" com.vaadin.sass.SassCompiler ./scss/styles-steel.scss ./VAADIN/themes/osbp-steel/styles.css
java -cp "./lib/*" com.vaadin.sass.SassCompiler ./scss/styles-cxo.scss ./VAADIN/themes/osbp-cxo/styles.css