@viewport {
  width: device-width ;
  zoom: 1.0 ;
}

body
{
    margin:0px;
    padding: 0px;
}

@media only screen and (min-width : 1000px) {  
.pc-img {
     min-height: 95% !important;
    height: 100%;
    width: 100%;
    background-image: url('images/pc.jpg');
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
    text-align: center;
    color: white;
	z-index: 1;
}
.buton{
	margin: auto;
	position: absolute;
	z-index: 3;
	bottom: 50%;
	margin-bottom: -80px;
	left: 50%;
	margin-left: -160px;
	
}

}

@media only screen and (min-width : 320px) and (max-width : 1000px)  {  
.pc-img {
   background-image: url('images/telefon.jpg');
   visibility: visible;
   min-height: 95% !important;
   height: 100%;
   width: 100%;
   background-repeat: no-repeat;
   background-position: center;
   background-size: cover;
   text-align: center;
   position:relative;
   color: white;
   z-index: 2;
}

.buton{
	margin: auto;
  position: absolute;
  z-index: 3;
  bottom: 50px;
  left: 50%;
  margin-left: -175px;
}

}