The paper treats the process of the creation of a web application optimal output for mobile devices in the form of a responsive layout with focus on the agrarian web portal. The utilization and testing of user experience (UX) techniques in four steps - UX, research, design and testing - were of great benefit. Two groups of five people representing the task group were employed for the research and testing. The resulting responsive layout was developed with the emphasis on the ergonomic layout of control elements and content, a conservative design, the securing of content accessibility for disabled users and the possibility of fast and simple updating. The resulting knowledge is applicable to web information sources in the agrarian sector (agriculture, food industry, forestry, water supply and distribution) and the development of rural areas. In wider context, this knowledge is valid in general.