Markup not allowed OceanWP

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Hi, I'm trying to remove the comments metadata from a widget in the footer and I managed to find this 👇

and when I enter the code:

.oceanwp-recent-posts .recent-posts-info .sep {
display: none;
}

.oceanwp-recent-posts .recent-posts-comments a {
display: none;
}

in Appearance > Customize > Custom CSS/JS it tells me that markup is not allowed (the preview of the widgets gets fine though).

Please help!

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