Hello can you help me to remove the button print from pdfviewer

Based on this pdf-viewr-addon/pdfviewer-addon/src/main/java/pl/pdfviewer/client/ui/VPdfViewer.java at vaadin8 · radekpakula/pdf-viewr-addon · GitHub using CSS

.v-button-print {
display: none;
}

Note this is add on for Vaadin 8.

i have tried it, it have not work