#c{
   position: fixed; 
   top:0; 
   left: 0; 
   z-index:-1; 
   opacity:0.8;
}
* {
     margin: 0;
     padding: 0;
     border: 0;
 }
  #div_digg1 {
     padding: 5px;
     position: fixed;
    _position: absolute;
     z-index: 1000;
     bottom: 5%;
     left: 3.5%;
    _left: 15px;
     border: 0;
 }