Web pages that are built with responsive design adapt to the viewing device's screen size without compromising readability or functionality. Utilizing modern web development tools like CSS3 and HTML5 will help to accomplish this interactive dynamic pages. This main aim of this research paper is to discuss insights about the CSS Fluid grids for responsive website development. The objective of the research is to attempt development ofnew CSS fluid grids for fundamental layout in responsive website and analyse the insights of CSS fluid grid for dynamic website creation. Primarily the contextual analysis was discussed and further, the outcome of the implemented fluid grid method and the key features were discussed extensively.