HTML

<svg class="dotloader2" version="1.1" id="L4" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
  viewBox="0 0 100 100" enable-background="new 0 0 0 0" xml:space="preserve">
  <circle fill="#fff" stroke="none" cx="30" cy="50" r="6">
    <animate
      attributeName="opacity"
      dur="1s"
      values="0;1;0"
      repeatCount="indefinite"
      begin="0.1"/>
  </circle>
  <circle fill="#fff" stroke="none" cx="50" cy="50" r="6">
    <animate
      attributeName="opacity"
      dur="1s"
      values="0;1;0"
      repeatCount="indefinite"
      begin="0.2"/>
  </circle>
  <circle fill="#fff" stroke="none" cx="70" cy="50" r="6">
    <animate
      attributeName="opacity"
      dur="1s"
      values="0;1;0"
      repeatCount="indefinite"
      begin="0.3"/>
  </circle>
</svg>

CSS


  .dotloader2 {
    width: 150px;
    height: 150px;
  }