Creating a complete responsive screen recorder tool with colorful styling and all its features is a complex task that goes beyond the scope of a simple code snippet. However, I can provide you with a basic HTML, CSS, and JavaScript template to get you started using the RecordRTC library for recording audio and video in the browser. Please note that you'll need to include the RecordRTC library in your project, which can be done by including its script in your HTML. Here's a simplified example to help you get started: ```html

Screen Recorder

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``` This is a basic template that allows you to start and stop recording the screen with audio. To make it more visually appealing, you can enhance the CSS styles further and add additional features as needed.