.img{width:360px;height:360px;max-width:100%;margin:0 auto;padding:0;position:relative;border:0} 
.iphone{ position:absolute;z-index:0;width:360px;height:360px;max-width:100%;} 
.iframe{ position:absolute;z-index:4;width:360px;height:360px;max-width:100%;} 
.imask{ position:absolute;z-index:3;width:360px;height:360px;max-width:100%;} 
.iphone .phone_img{
	width: 100%;
}
.iframe .frame{
    width: 100%;
}

.button_set {
    /*background-color: #4CAF50;  Green */
    border: none;
    color: white;
    padding: 20px 20px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 10px;
	border-radius: 30%;
}