.sk-wave {
  width: 10em;
  height: 4em;
  margin: auto;
  text-align: center;
  font-size: 1em;
}

.sk-wave .sk-rect {
  background-color: #D60000;
  height: 100%;
  width: 1.5em;
  display: inline-block;
  animation: sk-wave-stretch-delay 1.2s infinite ease-in-out;
}

.sk-wave .sk-rect-1 {
  animation-delay: -1.2s;
}

.sk-wave .sk-rect-2 {
  animation-delay: -1.3s;
}

.sk-wave .sk-rect-3 {
  animation-delay: -1.4s;
}

.sk-wave .sk-rect-4 {
  animation-delay: -1.5s;
}

.sk-wave .sk-rect-5 {
  animation-delay: -1.6s;
}

@keyframes sk-wave-stretch-delay {

  0%,
  40%,
  100% {
    transform: scaleY(0.4);
  }

  20% {
    transform: scaleY(1);
  }
}