body {
  background: #555555;
  text-align: center;
}
h1 {
  color: white;
  margin-top: 50px;
}

$color1: white;
$color2: white;
$color3: white;
$color4: #ffeeee;

.demo {
  position: absolute;
  margin: auto;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  width: 0;
  height: 0;
}

.crawl {
  animation: crawl 10s ease-in infinite;
  animation-direction: alternate;
}
.ui-triangle-loader {
  margin-top: 20px;
}

@keyframes crawl {
  0% { transform: translateX(0px); }
  7.5% { transform: translateX(0px); }
  10% { transform: translateX(20px); }
  17.5% { transform: translateX(20px); }
  20% { transform: translateX(40px); }
  27.5% { transform: translateX(40x); }
  30% { transform: translateX(60px); }
  37.5% { transform: translateX(60px); }
  40% { transform: translateX(80px); }
  47.5% { transform: translateX(80px); }
  50% { transform: translateX(100px); }
  57.5% { transform: translateX(100px); }
  60% { transform: translateX(120px); }
  67.5% { transform: translateX(120px); }
  70% { transform: translateX(140px); }
  77.5% { transform: translateX(140px); }
  80% { transform: translateX(160px); }
  87.5% { transform: translateX(160px); }
  90% { transform: translateX(180px); }
  97.5% { transform: translateX(180px); }
  100% { transform: translateX(200px); }
}

.ui-triangle-loader::before {
  content: "";
  display: block;
  width: 0;
  height: 0;
  border-left: 40px solid $color1;
  border-top: 40px solid transparent;
  border-bottom: 0px solid transparent;
  border-right: 0px solid transparent;
  animation: triangle-slide 1s ease-in infinite;
  animation-direction: reverse;
}

.crawl.ui-triangle-loader::before {
  position: relative;
  left: -100px;
  animation-direction: normal;
}

@keyframes triangle-slide {
  25% { 
    border-top-width: 0px;
    border-bottom-width: 40px;
    border-left-width: 40px;
    border-right-width: 0px;
    border-left-color: $color2;
    border-right-color: transparent;
    border-top-color: transparent;
    border-bottom-color: transparent;
  }
  25.001% {
    border-top-width: 40px;
    border-bottom-width: 0px;
    border-left-width: 0px;
    border-right-width: 40px;
    border-left-color: transparent;
    border-right-color: transparent;
    border-top-color: $color2;
    border-bottom-color: transparent;
  }
  50% {
    border-top-width: 40px;
    border-bottom-width: 0px;
    border-left-width: 40px;
    border-right-width: 0px;
    border-left-color: transparent;
    border-right-color: transparent;
    border-top-color: $color3;
    border-bottom-color: transparent;
  }
  50.001% {
    border-top-width: 0px;
    border-bottom-width: 40px;
    border-left-width: 0px;
    border-right-width: 40px;
    border-left-color: transparent;
    border-right-color: $color3;
    border-top-color: transparent;
    border-bottom-color: transparent;
  }
  75% {
    border-top-width: 40px;
    border-bottom-width: 0px;
    border-left-width: 0px;
    border-right-width: 40px;
    border-left-color: transparent;
    border-right-color: $color4;
    border-top-color: transparent;
    border-bottom-color: transparent;
  }
  75.001% {
    border-top-width: 0px;
    border-bottom-width: 40px;
    border-left-width: 40px;
    border-right-width: 0px;
    border-left-color: transparent;
    border-right-color: transparent;
    border-top-color: transparent;
    border-bottom-color: $color4;
  }
  100% { 
    border-top-width: 0px;
    border-bottom-width: 40px;
    border-left-width: 0px;
    border-right-width: 40px;
    border-left-color: transparent;
    border-right-color: transparent;
    border-top-color: transparent;
    border-bottom-color: $color1;
  }
}