title: DIV on the left side with flexible width but on the right side close to other DIV
body: <p>i have a site with a fixed width (960px) and i want to add a row that is always on the left but always on the right side close to another. how to do this with CSS? the problem is that the extra row has to have a flexible width AND has to be always on the left side of the screen but the right end has to end where the other (content) container ends on the right.</p>
  
  <p><img src="https://i.stack.imgur.com/lhMgZ.png" alt="enter image description here"></p>