/**/
.Absolute-Center {  
  margin: auto;  
  position: absolute;  
  top: 0; left: 0; bottom: 0; right: 0; 
  width: 50%;  
  height: 50%;  
  overflow: auto; 
  min-width: 300px;  
  max-width: 500px;  
  padding: 40px;  
}