body {
  overflow: hidden;
}

.app {
  background: #212121;
  color: #fff;
  letter-spacing: 0.08rem;
  width: 100vw;
  height: 100vh;
  position: relative;
}
a {
  color: #80CBC4;
}

.panes,
.controls,
.pane,
.image-pair,
.image-pair .image,
.sliders,
.slider {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

h2 {
  font-size: 1.2rem;
  margin: 0 0 1.5rem;
  color: #80CBC4;
}

.panes {
  height: calc(100% - 120px);
}
.pane,
.slider {
  width: calc(100% - 40px);
  height: calc(100% - 40px);
  top: 20px;
  left: 20px;
}
.pane {
  height: auto;
}

.controls {
  background: #00897b;
  height: 120px;
  top: auto;
  bottom: 0;
}

.image-pair {
  display: none;
  padding-top: 56.222547584%;
}
.image-pair.active {
  display: block;
}
.image-pair .image {
  background: no-repeat;
  background-size: auto 100%;
  background-position: top left;
  overflow: hidden;
}
.image-pair .image-right {
  left: 50%;
  width: 50%;
  background-position: top right;
}
.image-pair .label {
  color: #000;
  text-shadow: 0 2px rgba(255,255,255,0.4);
  font-size: 2rem;
  position: absolute;
  top: 20px;
  left: 20px;
  display: block;
}
.image-pair .image-right .label {
  left: auto;
  right: 20px;
}
.image-pair .caption {
  position: fixed;
  height: 60px;
  bottom: 120px;
  left: 0;
  width: 100%;
  text-align: center;
  background: #212121;
}

.button-next {
  display: inline-block;
  margin-right: 24px;
}

.sliders {
  text-align: right;
}
.sliders label {
}
.slider-horz {
  width: 98.2%;
  height: 10px;
  position: relative;
}

.ui-slider {
  background: #004D40;
}
.ui-slider .ui-slider-handle {
  background: #80CBC4;
  position: absolute;
  outline-color: #009688;
  cursor: move;
  cursor: grab;
  cursor: -moz-grab;
  cursor: -webkit-grab;
}
.ui-slider-horizontal {
  margin: 20px 0 20px;
}
.ui-slider .ui-slider-handle:active {
  cursor: grabbing;
  cursor: -moz-grabbing;
  cursor: -webkit-grabbing;
}
.ui-slider-horizontal .ui-slider-handle {
  top: 50%;
  height: 30px;
  width: 20px;
  margin-top: -15px;
}