How to hide a HTML button based on a if-condition?

I have a JSP page which includes a button called "Download".I want to hide this button based on a if-condition.

The Download button is meant to generate and download PDF onclick of it.Now, I have a List that is being fetched from the Controller and if this list is empty, I want to hide the "Download" button on the JSP page.

This is my button,

<button type="button" class="btn bg-red waves-effect" onclick="ExportPdf()">Download</button>  

I want to hide the button if the List is empty.