.image1{
 display: none;
    position: relative;
    position: fixed;
    z-index: 5000;
    bottom:0px;
    left:60px;
    width:60px;
   height:60px;
}
.image2{
    display: none;
    position: relative;
    position: fixed;
    z-index: 5000;
    bottom:0px;
    left:0px;
    width:60px;
   height:60px;
    
}
.image3{
    display: block;
    position: relative;
    position: fixed;
    z-index: 5000;
    bottom: 0px;
    left: 0px;
    width:80px;
   height:80px;
    
}
@media screen and (max-width:769px)
{
     .image1{
	 display:block;
	 }
    .image2{
        display: block;
    
    }
    .image3{
        display: none;
    }
  }