index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .loader {
  border: 2px solid #008ac9;
  width: 48px;
  height: 48px;
  background: #008ac9;
  border-radius: 50%;
  display: inline-block;
  position: relative;
  box-sizing: border-box;
  animation: rotation 2s linear infinite;
}
.loader::after {
  content: '';  
  box-sizing: border-box;
  position: absolute;
  left: 50%;
  top: 50%;
  border: 24px solid;
  border-color: transparent #FFF;
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

@keyframes rotation {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
} 
    </style>
</head>
<body>
    <span class="loader"></span>
</body>
</html>