This code checks if the current page is a single post (is_single()) and then outputs CSS to hide the post title by setting display: none on elements with the entry-title class.
This should work with most themes, but if your theme uses a different class for post titles, you may need to adjust the CSS selector accordingly.
.dm-code-snippet.dark {
background: $default-bg;
padding: 40px 35px 45px 35px;
margin: 30px 0;
}