Dec 12, 2016 · Customizing Style Sheets. Although configuring the viewport is an important way to optimize your web content for iOS, style sheets provide further techniques for optimizing. For example, use iOS CSS extensions to control text resizing and element highlighting. Yes, CSS for PowerApps, kinda. Actual CSS based style sheets are not possible, but the next best thing is. We can create a few objects to store our styles in, like colors, font sizes, dimensions, etc. and then reference them across the app. CSS stands for Cascading Style Sheets with an emphasis placed on “Style.” While HTML is used to structure a web document (defining things like headlines and paragraphs, and allowing you to embed images, video, and other media), CSS comes through and specifies your document’s style—page layouts, colors, and fonts are all determined with CSS.