Here's a simple example of a web UI in JavaScript:

```javascript
<!DOCTYPE html>
<html>
  <head>
    <title>My Thought Organizer</title>
  </head>
  <body>
    <h1>Welcome to My Thought Organizer</h1>
    <form>
      <label for="title">Title:</label>
      <input type="text" id="title" name="title"><br><br>
      <label for="content">Content:</label><br>
      <textarea id="content" name="content"></textarea><br><br>
      <input type="submit" value="Save">
    </form>
  </body>
</html>
```

This code creates a simple web page with a form that allows users to enter a title and content for their thoughts. When the user clicks the "Save" button, the form data can be sent to a server using JavaScript or another programming language. This is just a basic example, but you can customize the UI to fit your specific needs and preferences.
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