DevExpress offers several ways of customizing ASPxCardView appearance.
Cascading Style Sheet (CSS) Classes
Use cascading style sheet (CSS) classes. CSS styles define how elements are rendered, as well as their position on the page. This provides you with centralized control over the appearance of several controls or the entire website. ASPxCardView ships with a number of predefined themes. You can also create your own themes.
ASPxCardView provides multiple styles, so you can customize the appearance of individual elements and manage the grid's overall appearance. Each style property has a number of attributes that allow you to customize element appearance to the maximum extent allowed by web browsers. These attributes include: colors, font, borders, content alignment, text attributes, etc.