Abstract: The present technology includes a method and a system for creating web pages without needing to write HTML and CSS manually. The interface module of the present invention displays a collection of user-definable component templates and a graphical presentation area for a document containing markup data, where the user can edit/preview an HTML document. The present technology enables the user to design the responsive layout of the HTML document by dragging-and-dropping components in a column-structure of the document layout, insert one component into the other, and adjust visually and through drag operations the CSS properties margin and padding of the components. During the above mentioned operations the column-structure is created and managed automatically according to user-interactions. Additionally, the technology described herein contemplates a method of providing the user with a supportive visual feedback during the above-mentioned operations.