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


/* fullscreen setup */
html, body {
    /* give this to all tags from html to .fullscreen */
    height:100%;
}
.fullscreen,
.content-a {
    width:100%;
    height:100%;
    overflow:hidden;
	box-sizing: border-box;
}
.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;
    text-align:center;
}