doc/dev/plugins/presentation/css/transition.css

/* Transition */
#page_transition {
  position: fixed;
  background: white;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 1;
  visibility: visible;
  transition: opacity 0.5s, visibility 0.5s;
  overflow: hidden;
  z-index: 1000;
}
#page_transition .la-line-scale {
  margin: 25% auto;
}

/*!
 * Load Awesome v1.1.0 (http://github.danielcardoso.net/load-awesome/)
 * Copyright 2015 Daniel Cardoso <@DanielCardoso>
 * Licensed under MIT
 */
.la-line-scale,
.la-line-scale > div {
  position: relative;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}
.la-line-scale {
  display: block;
  font-size: 0;
  color: #fff;
}
.la-line-scale.la-dark {
  color: #333;
}
.la-line-scale > div {
  display: inline-block;
  float: none;
  background-color: currentColor;
  border: 0 solid currentColor;
}
.la-line-scale {
  text-align: center !important;
  width: 40px;
  height: 32px;
}
.la-line-scale > div {
  width: 4px;
  height: 32px;
  margin: 2px;
  margin-top: 0;
  margin-bottom: 0;
  border-radius: 0;
  -webkit-animation: line-scale 1.2s infinite ease;
  -moz-animation: line-scale 1.2s infinite ease;
  -o-animation: line-scale 1.2s infinite ease;
  animation: line-scale 1.2s infinite ease;
}
.la-line-scale > div:nth-child(1) {
  -webkit-animation-delay: -1.2s;
  -moz-animation-delay: -1.2s;
  -o-animation-delay: -1.2s;
  animation-delay: -1.2s;
}
.la-line-scale > div:nth-child(2) {
  -webkit-animation-delay: -1.1s;
  -moz-animation-delay: -1.1s;
  -o-animation-delay: -1.1s;
  animation-delay: -1.1s;
}
.la-line-scale > div:nth-child(3) {
  -webkit-animation-delay: -1s;
  -moz-animation-delay: -1s;
  -o-animation-delay: -1s;
  animation-delay: -1s;
}
.la-line-scale > div:nth-child(4) {
  -webkit-animation-delay: -0.9s;
  -moz-animation-delay: -0.9s;
  -o-animation-delay: -0.9s;
  animation-delay: -0.9s;
}
.la-line-scale > div:nth-child(5) {
  -webkit-animation-delay: -0.8s;
  -moz-animation-delay: -0.8s;
  -o-animation-delay: -0.8s;
  animation-delay: -0.8s;
}
.la-line-scale.la-sm {
  width: 20px;
  height: 16px;
}
.la-line-scale.la-sm > div {
  width: 2px;
  height: 16px;
  margin: 1px;
  margin-top: 0;
  margin-bottom: 0;
}
.la-line-scale.la-2x {
  width: 80px;
  height: 64px;
}
.la-line-scale.la-2x > div {
  width: 8px;
  height: 64px;
  margin: 4px;
  margin-top: 0;
  margin-bottom: 0;
}
.la-line-scale.la-3x {
  width: 200px;
  height: 96px;
}
.la-line-scale.la-3x > div {
  width: 12px;
  height: 96px;
  margin: 6px;
  margin-top: 0;
  margin-bottom: 0;
}
/*
 * Animation
 */
@-webkit-keyframes line-scale {
  0%,
  40%,
  100% {
    -webkit-transform: scaleY(0.4);
    transform: scaleY(0.4);
  }
  20% {
    -webkit-transform: scaleY(1);
    transform: scaleY(1);
  }
}
@-moz-keyframes line-scale {
  0%,
  40%,
  100% {
    -webkit-transform: scaleY(0.4);
    -moz-transform: scaleY(0.4);
    transform: scaleY(0.4);
  }
  20% {
    -webkit-transform: scaleY(1);
    -moz-transform: scaleY(1);
    transform: scaleY(1);
  }
}
@-o-keyframes line-scale {
  0%,
  40%,
  100% {
    -webkit-transform: scaleY(0.4);
    -o-transform: scaleY(0.4);
    transform: scaleY(0.4);
  }
  20% {
    -webkit-transform: scaleY(1);
    -o-transform: scaleY(1);
    transform: scaleY(1);
  }
}
@keyframes line-scale {
  0%,
  40%,
  100% {
    -webkit-transform: scaleY(0.4);
    -moz-transform: scaleY(0.4);
    -o-transform: scaleY(0.4);
    transform: scaleY(0.4);
  }
  20% {
    -webkit-transform: scaleY(1);
    -moz-transform: scaleY(1);
    -o-transform: scaleY(1);
    transform: scaleY(1);
  }
}