/* background setup */
.background {
    background-repeat:no-repeat;
    /* custom background-position */
    background-position:50% 50%;
    /* ie8- graceful degradation */
    background-position:50% 50%\9 !important;
}

.fullscreen,
.content-a {
    width:100%;
    height:100%;
    overflow:hidden;
}
.fullscreen.overflow,
.fullscreen.overflow .content-a {
    height:auto;
    min-height:100%;
}

/* content centering styles */
.content-a {
    display:table;
}
.content-b {
	display:table-cell;
    position:relative;
	vertical-align:middle;
}