body {
  margin: 0;
  padding: 0;
}

.preloader {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  justify-content: center;
  align-items: center;
}

.preloader span {
  display: block;
  height: 15px;
  width: 15px;
  background: #19e3d5;
  margin: 0 7px;
  border-radius: 10px;
  animation: 1.2s upDown infinite;
}

.preloader span:first-child {
  animation-delay: 0.15s;
}

.preloader span:nth-child(2) {
  animation-delay: 0.3s;
}

.preloader span:nth-child(3) {
  animation-delay: 0.45s;
}

.preloader span:nth-child(4) {
  animation-delay: 0.6s;
}

.preloader span:last-child {
  animation-delay: 0.75s;
}

@keyframes upDown {
  0% {
    height: 15px;
    background: #19e3d5;
  }

  50% {
    height: 60px;
    background: #d33deb;
  }

  100% {
    height: 15px;
    background: #f00e43;
  }
}