Explore the intricacies of building components that appear on top of other content in this conference talk from CSS Day 2023. Dive deep into dialogs, tooltips, date pickers, menus, and teaching UI, discovering various construction methods and new web platform features that simplify their implementation. Learn about the innovative 'popover' attribute, understand the concept of "modality," and master the use of the top layer. Gain insights into creating these components with minimal or no JavaScript. Access accompanying slides for visual reference and further explore the speaker's expertise through their blog. Stay updated on future web development conferences by following CSS Day's social media or subscribing to their newsletter.