title: convert element sizes from PSD to HTML with responsive design
body: <p>I have to convert a PSD file to an HTML5 with responsive design.
  It's the first time I do it I would like some clear orientation. </p>
  
  <p>When i extract the CSS files from the PSD I see strange things like all element are in position=absolute, which seems quite dummy. I assume I have to change it according to the new HTML?</p>
  
  <p>How to make it responsive to different screen widhts and heights as well as mobile? If I directly embed to Bootstrap elements is supposed to do that? </p>
  
  <p>should I calculate from the PSD the relative sizes of each element (relative to the height and widht of the PSD file) and convert to %? (ex: body of the PSD file 100px, 1 element in PSD file 50px->CSS of the element1 in HTML 50%)</p>