You need to be more specific to override existing CSS.
You can add this to your theme, or by going to "Appearance > Customize > Additional CSS" from your wp-admin.
Replace the Page ID with the page ID of your page... You can find it by looking at the admin page ID, or inspecting the <body> tag. Wordpress puts the page-id-xxx class in the body of every page, allowing you to override specific CSS on a page by page basis.
/* Replace Page ID with your page id */
.page-id-336 .title-banner {
display: none;
}
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