body {
	background-repeat: repeat-x repeat-y;
	background-position: top;
	background-image:url(background.png);
	
}
.responsive-container {
    position: relative;
    width: 100%;
    }

.dummy {
    padding-top: 50%; /* forces 1:1 aspect ratio */
}

.img-container {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    
    text-align:center; /* Align center inline elements */
    font: 0/0 a;
}

.img-container .centerer {
    display: inline-block;
    vertical-align: middle;
    height: 100%;
}

.img-container img {
    vertical-align: middle;
    display: inline-block;
    max-height: 100%;  /* <-- Set maximum height to 100% of its parent */
    max-width: 100%;   /* <-- Set maximum width to 100% of its parent */
}