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<head>
  <link rel="stylesheet" type="text/css" href="style.css">
</head>

<body>
  <div class="loader">
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
  </div>
</body>

{
  margin: 0;
  padding: 0;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: #73b;
}

.loader {
  position: relative;
  width: 300px;
  height: 300px;
  transform-style: preserve-3d;
  transform: perspective(500px) rotateX(60deg);
}

.loader span {
  position: absolute;
  display: block;
  border: 5px solid #fff;
  box-shadow: 0 5px 0 #ccc;
        inset 0 5px 0 #ccc;
  border-radius: 50%;
  animation: animate 3s ease-in-out infinite;
}

@keyframes animate {
  0%, 100%{
    transform: translateZ(-100px);
  }
  50% {
    transform: translateZ(100px);
  }
}

.loader span:nth-child(1) {
  top: 0px;
  left: 0px;
  bottom: 0px;
  right: 0px;
  animation-delay: 1.5s;
}

.loader span:nth-child(2) {
  top: 10px;
  left: 10px;
  bottom: 10px;
  right: 10px;
  animation-delay: 1.4s;
}

.loader span:nth-child(3) {
  top: 20px;
  left: 20px;
  bottom: 20px;
  right: 20px;
  animation-delay: 1.2s;
}

.loader span:nth-child(4) {
  top: 30px;
  left: 30px;
  bottom: 30px;
  right: 30px;
  animation-delay: 1.1s;
}

.loader span:nth-child(5) {
  top: 40px;
  left: 40px;
  bottom: 40px;
  right: 40px;
  animation-delay: 1.0s;
}

.loader span:nth-child(6) {
  top: 50px;
  left: 50px;
  bottom: 50px;
  right: 50px;
  animation-delay: 0.9s;
}

.loader span:nth-child(7) {
  top: 60px;
  left: 60px;
  bottom: 60px;
  right: 60px;
  animation-delay: 0.8s;
}

.loader span:nth-child(8) {
  top: 70px;
  left: 70px;
  bottom: 70px;
  right: 70px;
  animation-delay: 0.7s;
}

.loader span:nth-child(9) {
  top: 80px;
  left: 80px;
  bottom: 80px;
  right: 80px;
  animation-delay: 0.6s;
}

.loader span:nth-child(10) {
  top: 90px;
  left: 90px;
  bottom: 90px;
  right: 90px;
  animation-delay: 0.5s;
}

.loader span:nth-child(11) {
  top: 100px;
  left: 100px;
  bottom: 100px;
  right: 100px;
  animation-delay: 0.4s;
}

.loader span:nth-child(12) {
  top: 110px;
  left: 110px;
  bottom: 110px;
  right: 110px;
  animation-delay: 0.3s;
}

.loader span:nth-child(13) {
  top: 120px;
  left: 120px;
  bottom: 120px;
  right: 120px;
  animation-delay: 0.2s;
}

.loader span:nth-child(14) {
  top: 130px;
  left: 130px;
  bottom: 130px;
  right: 130px;
  animation-delay: 0.1s;
}

.loader span:nth-child(15) {
  top: 140px;
  left: 140px;
  bottom: 140px;
  right: 140px;
  animation-delay: 0s;
}