html, body   { 
 
               background-image: url('bg.jpg');

               padding: 0; 

               margin: 0; 

               height: 100%; 

               width: 100%; 

             } 

html
             { 

               display: table; 

             } 

body

             { 
               display: table-cell; 
               vertical-align: middle;
             } 

.middle

             {


               width: 700px; 

               margin: 0 auto;
               

             }