1. Open up the Webflow Designer for your project.
2. Head over to the "Pages" panel and pick the page where you want to add those custom breakpoints.
3. Click the gear icon next to the page name to open up "Page Settings."
4. Scroll down until you find the "Custom Code" section.
5. You'll be adding your custom breakpoint CSS within the <style> tags under either the "Inside Head Tag" or "Inside Body Tag" options. Usually, it's better to put it under "Inside Head Tag" for better organization.

1. Write your custom CSS media queries in the provided text area. For example:

   ```css

   ```

2. Make sure each media query targets the specific screen sizes and selectors you need for your design.

1. Go back to the Webflow Designer.
2. Assign the custom class (like .example-class) to the elements you want to be affected by the breakpoints.
3. Use the Style panel to make any other adjustments you need.

1. Use Webflow’s built-in responsive design tools to preview how the custom breakpoints affect your design. Toggle between different device views to see the changes.
2. Make any additional adjustments to the CSS if necessary to ensure the design looks good across all specified breakpoints.

1. After confirming that everything looks correct in the preview mode, go back to the Webflow Designer.
2. Click the "Publish" button in the top-right corner to publish the changes to your live site.
3. Check the changes on different devices to make sure the custom breakpoints are working correctly.

By following these steps, you'll have custom breakpoints successfully implemented in your Webflow project, giving you precise control over your design at various screen sizes. Make sure to tweak the values and styles according to the specific needs of your project.