html,body {
  padding:10px;
  height:97%;
  background-image:url("bg.gif");
  background-size: 800px;
  background-repeat:repeat;
  vertical-align: middle;
} 

.son{
 display:none; 
}

.frame{
  text-align: center;
  vertical-align: middle;
  height: 100%;
}

img{
  display: inline;
  vertical-align: middle;
  max-width: 100%;
  max-height: 100%;
}