gridactually.css

body {
  overflow: hidden;
  background: #fff;
  margin: 0;
  padding: 0;
}

h1 {
  margin-top: -80px;
  position: absolute;
  top: 50%;
  width: 100%;
  z-index: 2;
  color: #333;
  text-align: center;
  font: 200 9vh/15vh "Helvetica Neue", "Roboto-Light", "Segoe UI", Helvetica, Arial, sans-serif;
  background: rgba(255,255,255,0.91);
  padding: 20px 0;
}

.gridactually-container {
  width: 100%;
  overflow: hidden;
}

.gridactually {
  height: 100%;
  background-color: #fff;
  width: auto;
  overflow: hidden;
  z-index: 0;
}

.gridactually .box {
  float: left;
  perspective: 1000;
}

.gridactually .box.flipped .images {
  -webkit-transform: rotate3d(0, 1, 0, 180deg);
  -moz-transform: rotate3d(0, 1, 0, 180deg);
  -o-transform: rotate3d(0, 1, 0, 180deg);
  -ms-transform: rotate3d(0, 1, 0, 180deg);
  transform: rotate3d(0, 1, 0, 180deg);
}

.gridactually .box .images {
  -webkit-transition: -webkit-transform 0.6s;
  -moz-transition: -moz-transform 0.6s;
  -o-transition: -o-transform 0.6s;
  -ms-transition: -ms-transform 0.6s;
  transition: transform 0.6s;
  -webkit-transform-style: preserve-3d;
  -moz-transform-style: preserve-3d;
  -o-transform-style: preserve-3d;
  -ms-transform-style: preserve-3d;
  transform-style: preserve-3d;
  position: relative;
}

/* hide back of pane during swap */
.gridactually .box .front,
.gridactually .box .back {
  -webkit-backface-visibility: hidden;
  -moz-backface-visibility: hidden;
  backface-visibility: hidden;
  position: absolute;
  top: 0;
  left: 0;
}
.gridactually .box .front {
  z-index: 1;
  background-repeat: no-repeat;
  background-color: #999;
  background-size: cover;
}

.gridactually .box .back {
  -webkit-transform: rotate3d(0, 1, 0, 180deg);
  -moz-transform: rotate3d(0, 1, 0, 180deg);
  -o-transform: rotate3d(0, 1, 0, 180deg);
  -ms-transform: rotate3d(0, 1, 0, 180deg);
  transform: rotate3d(0, 1, 0, 180deg);
}

.gridactually-image {
  position: absolute;
  top: -3000px;
}

.gridactually-overlay {
  background-color: rgba(255, 255, 255, 0.14);
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  width: 100%;
}