Styling Xamarin.Forms Apps
Styling a Xamarin.Forms app is traditionally accomplished by using the
Style class to group a collection of property values into one object that can then be applied to multiple visual element instances. This helps to reduce repetitive markup, and allows an apps appearance to be more easily changed.
Xamarin.Forms supports styling visual elements using Cascading Style Sheets (CSS). A style sheet consists of a list of rules, with each rule consisting of one or more selectors, and a declaration block.