When using the zk-spreadsheet along with zk-bootstrap the look and feel of the spreadsheet is incorrect. This can be reproduced by placing zkbootstrap.jar in the classpath of the application. I have also tried using bootstrap directly and including the css directly in the zul pages were it is needed. Since I need to place the zk-spreadsheet in a tab that is using bootstrap styling the zk-spreadsheet look and feel is incorrect. If I access the zk-spreadsheet in a zul that is not using the bootstrap css then the spreadsheet looks right. My intuition is that there is a conflict between the styles used by bootstrap and zk-spreadsheet.