[Theme: Pictorico] Remove Page Titles

Hi, all. I’m trying to remove page titles, and it seems my current CSS is suddenly not working. Here’s what I’m using now (which isn’t doing the trick):

/* Remove Titles on Specific Pages and Posts */
.page-id-2261 .entry-title, .page-id-604 .entry-title, .page-id-536 .entry-title, .page-id-250 .entry-title {display: none;}