When modernizing a legacy Windows desktop application, developers are confronted with a variety of web technologies and different programming paradigms for the front-end. By selecting the appropriate web technologies and frameworks, Windows developers can avoid the need to master challenging technologies such as CSS. This presentation provides a brief overview and practical guidance on the knowledge that Windows developers can easily transfer, as well as the main differences in developing a front-end for the web. Using the React- and Material-UI framework, participants will be shown the essential differences and how they can largely avoid cumbersome topics such as CSS. At the end of this session, former Windows developers will have knowledge of a basic set of technologies to start building a web front-end.