<div class="loader">
      <div style="--i: 1"></div>
      <div style="--i: 2"></div>
      <div style="--i: 3"></div>
      <div style="--i: 4"></div>
    </div>

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background: linear-gradient(to right, #917173, #2a3b36, #432c52);
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.loader {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.loader::before {
  content: "";
  background: rgba(255, 255, 255, 0);
  backdrop-filter: blur(8px);
  position: absolute;
  width: 140px;
  height: 55px;
  z-index: 20;
  border-radius: 0 0 10px 10px;
  border: 1px solid rgba(255, 255, 255, 0.274);
  border-top: none;
  box-shadow: 0 15px 20px rgba(0, 0, 0, 0.082);
  animation: anim2 2s infinite;
}

.loader div {
  background: rgb(228, 228, 228);
  border-radius: 50%;
  width: 25px;
  height: 25px;
  z-index: -1;
  animation: anim 2s infinite linear;
  animation-delay: calc(-0.3s * var(--i));
  transform: translateY(5px);
  margin: 0.2em;
}

@keyframes anim {
  0%,
  100% {
    transform: translateY(5px);
  }
  50% {
    transform: translateY(-65px);
  }
}

@keyframes anim2 {
  0%,
  100% {
    transform: rotate(-10deg);
  }
  50% {
    transform: rotate(10deg);
  }
}