I've been working on creating a feature similar to the one found in Google Maps using HTML, CSS, and JavaScript. However, I have had trouble finding examples or resources on how to implement this particular element. Despite searching for terms like 'drawer', 'draggable content', and 'content above fixed background', I haven't been able to find useful information. Therefore, I am seeking guidance, examples, or best practices that can help me achieve this functionality smoothly, especially for mobile devices.