How can the thin black lines be removed from YouTube videos in Webflow?

To remove the thin black lines from YouTube videos in Webflow, you would need to target the embedded video element and apply some custom CSS. Here are the steps you can follow:

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1. Identify the embedded YouTube video element on your Webflow page. It is usually represented as an `<iframe>` tag.

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2. Give the embedded video element a custom class or ID to make it easier to target with CSS. You can do this by selecting the video element, going to the "Settings" panel on the right, and adding a class or ID under the "Class" or "ID" field.

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3. Once you have a class or ID added to your video element, you can now write custom CSS to remove the black lines. You have two options here:

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   a) Target the class or ID directly: For example, if you assigned the class "my-video" to the video element, you can target it with CSS using `.my-video`.

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   b) Target the `<iframe>` directly: If you didn't assign a class or ID, you can target the `<iframe>` parent element using `iframe` in your CSS.

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4. Now, to remove the black lines, you can use the `border` property in CSS. Set it to "none" or "0" to remove the border. Here's an example of the CSS you can use:

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```css

.my-video, iframe {

  border: none;

}

```

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5. Apply the CSS. If you have a custom class or ID, add the CSS code to your Webflow project by going to the "Project settings" in the top-right corner of the Webflow Designer, selecting the "Custom Code" tab, and adding the code to either the "Head code" or "Before body end tag" field. If you targeted the `<iframe>` directly, you can add the CSS code inline in the HTML embed code.

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6. Save your changes and publish the site. After publishing, the black lines around the YouTube video should be removed.

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Remember to adapt the CSS code to your specific class, ID, or `<iframe>` targeting. Additionally, keep in mind that YouTube may update their embed code in the future, so you might need to adjust the CSS accordingly to target the video element correctly.

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It's always a good practice to preview your changes on different devices and browsers to ensure that the black lines are consistently removed across all platforms.