#supersized-loader { position:absolute; top:50%; left:50%; z-index:0; width:60px; height:60px; margin:-30px 0 0 -30px; text-indent:-999em; background:url(img/progress.gif) no-repeat center center;}

#supersized {  display:block; position:fixed; left:0; top:0; overflow:hidden; z-index:-999; height:100%; width:100%; }
#supersized img { width:auto; height:auto; position:relative; display:none; outline:none; border:none; }
#supersized.speed img { -ms-interpolation-mode:nearest-neighbor; image-rendering: -moz-crisp-edges; }
#supersized.quality img { -ms-interpolation-mode:bicubic; image-rendering: optimizeQuality; }

#supersized li { display:block; list-style:none; z-index:-30; position:fixed; overflow:hidden; top:0; left:0; width:100%; height:100%; background:#111; }
#supersized a { width:100%; height:100%; display:block; }
#supersized li.prevslide { z-index:-20; }
#supersized li.activeslide { z-index:-10; }
#supersized li.image-loading { background:#111 url(img/progress.gif) no-repeat center center; width:100%; height:100%; }
#supersized li.image-loading img{ visibility:hidden; }
#supersized li.prevslide img, #supersized li.activeslide img{ display:inline; }

.container {
  display: flex;
  justify-content: center;
  align-items: center;
}

.inner{
  width: 100%;
  margin: 0 auto;
  max-width: 900px;
}

.outer{
    height: 10rem;
    text-align: center;
}