Creating a complete responsive "Break Line Removal" tool with colorful styling and all its features using HTML, CSS, and JavaScript can be a bit lengthy, but I'll provide you with a basic example to get you started. You can further enhance and style it as needed. ```html

Break Line Removal Tool

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``` This code provides a simple web page with a textarea to input text, a button to remove line breaks, and a div to display the result. It also includes basic styling to make it look visually appealing. You can further customize the styling and add more features as needed.