.loader {
  position: fixed;
  display: flex;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  --brick-height: 120px;
  --brick-width: 65px;
  display: none;
}

.loader h1 {
  position: absolute;
  color: #FFF;
  font-weight: bold;
  z-index: 99;
  text-align: center;
  width: 400px;
  padding: 50px;
}

.loader .brick {
  width: var(--brick-width);
  height: var(--brick-height);
  --brick-bg: #AB3638;
  --brick-cr-bg: #892B2D;
  background: var(--brick-bg);
  margin: 0 0;
  position: relative;
  z-index: 2;
}
.loader .brick:after, .loader .brick:before {
  content: "";
  position: absolute;
  right: -20px;
  top: 15px;
  width: 20px;
  height: 35px;
  z-index: -1;
  background: var(--brick-bg);
  box-shadow: 10px -20px 0px 0px var(--brick-cr-bg) inset;
}
.loader .brick:before {
  top: auto;
  bottom: 15px;
}
.loader .brick:nth-child(1) {
  --brick-bg: hsl(0deg 46% 38.12%);
}
.loader .brick:nth-child(2) {
  --brick-bg: hsl(0deg 48% 40.12%);
}
.loader .brick:nth-child(3) {
  --brick-bg: hsl(0deg 50% 42.12%);
}
.loader .brick:nth-child(4) {
  --brick-bg: hsl(0deg 52% 44.12%);
}
.loader .brick:not(:last-child) {
  animation: slide 1s ease-in-out infinite;
}
.loader .brick:last-child {
  animation: drop 1s ease-in-out infinite;
}

@keyframes slide {
  0% {
    transform: translateX(0);
  }
  20%, 100% {
    transform: translateX(calc(var( --brick-width) * 1));
  }
}
@keyframes drop {
  0% {
    transform: translate(0, 0);
    opacity: 1;
    z-index: 3;
  }
  20% {
    transform: translate(calc(var(--brick-width) * 1.5), 0);
    opacity: 1;
    z-index: 3;
  }
  40% {
    transform: translate(calc(var(--brick-width) * 1.5), 100vh);
    opacity: 1;
    z-index: 3;
  }
  60% {
    transform: translate(-100vw, 50vh);
    opacity: 0;
    z-index: 1;
    --brick-bg: hsl(0deg 46% 38.12%);
  }
  80% {
    transform: translate(-100vw, 0);
    opacity: 1;
    z-index: 1;
    --brick-bg: hsl(0deg 46% 38.12%);
  }
  100% {
    transform: translate(calc(var(--brick-width) * -4), 0);
    opacity: 1;
    z-index: 1;
    --brick-bg: hsl(0deg 46% 38.12%);
  }
}