html,body,div {
  height: 100%;
  width: 100%;
  padding: 0;
  margin: 0;
}

body {
  /*background: #333;*/
  background: url('../images/marble-texture1-min.jpg') center center no-repeat;
  background-size: cover;
}

div {
  overflow: hidden;
  position: relative;
}

.second {
  position: absolute;
  top: -100%;
  left: 0;
  height: 100%;
  width: 100%;
  /*background: #ddd;*/
  -webkit-transform-origin: 0 100%;
  -moz-transform-origin: 0 100%;
  transform-origin: 0 100%;
  overflow: hidden;
  transition: top 850ms linear, left 850ms linear;
}

.first {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  background: #ccc;
  -webkit-transform-origin: 0 0;
  -moz-transform-origin: 0 0;
  transform-origin: 0 0;
  overflow: hidden;
  transition: top 850ms linear, left 850ms linear;
}

.first-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  -webkit-transform-origin: 0 0;
  -moz-transform-origin: 0 0;
  transform-origin: 0 0;
}

.first-img img {
  min-width: 100%;
  height: auto;
  min-height: 100%;
}

.second-img img {
  min-width: 100%;
  min-height: 100%;
  height: auto;
}

.second-img {
  position: absolute;
  top: 0;
  right: 0;
  width: 100%;
  height: 100%;
  transform-origin: 100% 100%;
}

.logo {
  position: absolute;
  
  top: 45%;
  left: 51%;
  
  z-index: 80;
  transform: translateY(-50%) translateX(-50%);
  height: 40vh;
  width: 60vw;

  /*height: 35vh;
  width: 35vw;*/
}

.logo img {
  width: 100%;
  height: auto;/*100%;*/
}


/* make logo absolute here as well */

button {
  position: absolute;
  top: 90%;
  left: 50%;
  background: rgba(0, 0, 0, 0.0);
  border: 3px solid black;
  color: black;
  font-size: 25px;
  font-weight: bold;
  text-transform: uppercase;
  padding: 15px 30px;
  cursor: pointer;
  z-index: 20;
  transform: translateY(-50%) translateX(-50%);
  border-radius: 500px;
}

button:hover {
  background: none;
  border: 2px solid white;
  color: white;
}

button:focus {
  outline: none;
}

.split .first {
  top: 100%;
  left: -100%;
}

.split .second {
  top: -200%;
  left: 100%;
}

.first-img:before,.second-img:before {
  display: block;
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 10;
  background: rgba(0, 0, 0, 0.45);
}