html, body { overflow:hidden;background-color: #000; }

.background {
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center center;
  overflow: hidden;
  will-change: transform;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  height: 100vh;
  position: fixed;
  width: 100%;
  -webkit-transition: all 1s cubic-bezier(0.22,0.44, 0.5, 1);
  transition: all 1s  cubic-bezier(0.22, 0.44, 0.5, 1);

}

.background { background-image: url(/img/spec.png);}
.background:nth-child(2) { background-image: url(/img/find_reedom.png); }


.background:nth-child(1) { z-index: 2; }
.background:nth-child(2) { z-index: 1; }


