title: Page width exceeds the 100% of the screen width
body: <p>I have a strange problem, I was designing a page and after I finished, found that there is a horizontal scroll bar in the bottom of the page, I checked the page html but found that there is a close tag for each tag.</p>
  
  <p>Also I tried to check the widths using jQuery and found that 
  $(window).width()      =   1351px
  and 
  $(document).width()    =   1480px</p>
  
  <p>any suggestions about what reason for this problem ?</p>