title: How to setup HTML for mobile Devices with an header-image, that takes whole width of browser?
body: <p>my concern is that I have to build a website for mobile devices. In the concept is an image set as header.</p>
  
  <p>The problem is now: Different smartphones have different display resolutions.</p>
  
  <p>There are e.g. 840x560, 480x320 or 800x480.</p>
  
  <p>What do I have to write as meta-tags, css, etc. to fit the image in "every" modern smartphone to the display?</p>
  
  <p>I hope my concern was clearly described.</p>
  
  <p>Thanks, Chris</p>