title: SharePoint Online cannot expand web part zone width
body: <p>I have a blog subsite on a SharePoint Online (2013) site that by default has 3 web part zones: BlogNavigator, Left and Right (ordered from left to right).</p>
  
  <p><a href="https://i.stack.imgur.com/ysjTv.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ysjTv.jpg" alt="enter image description here"></a></p>
  
  <p>The layout of the zones is frustrating, because the Left zone, which houses the actual content for the site, is relatively narrow considering the amount of available space to the right of the Right zone.</p>
  
  <p>When I move all the Web Parts from the Right zone into BlogNavigator, the Left zone maintains its size, even though there is room to expand rightward.</p>
  
  <p>I have tried manually declaring the Left zone <a href="https://msdn.microsoft.com/en-us/library/cc767506.aspx" rel="nofollow noreferrer">ContainerWidth</a> on the page file in SP Designer, I have tried applying a <a href="https://social.msdn.microsoft.com/Forums/sharepoint/en-US/18bf53d1-30c6-4a25-a838-c8c370531deb/how-to-fix-web-part-zone-width?forum=sharepointcustomizationlegacy" rel="nofollow noreferrer">CSS file</a> to the page to set the width, but nothing seems to work. </p>
  
  <p>I have even removed all references to the Right zone on the page file, removing it completely, but the Left zone still remains its original width.</p>
  
  <p>Is there some way I can alter this zone?</p>