HTML



    <svg version="1.1" id="lineLoader" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
       width="24px" height="30px" viewBox="0 0 24 30" style="enable-background:new 0 0 50 50;" xml:space="preserve">
      <rect x="0" y="10" width="4" height="10" fill="#fff" opacity="0.2">
        <animate attributeName="opacity" attributeType="XML" values="0.2; 1; .2" begin="0s" dur="0.6s" repeatCount="indefinite" />
        <animate attributeName="height" attributeType="XML" values="10; 20; 10" begin="0s" dur="0.6s" repeatCount="indefinite" />
        <animate attributeName="y" attributeType="XML" values="10; 5; 10" begin="0s" dur="0.6s" repeatCount="indefinite" />
      </rect>
      <rect x="8" y="10" width="4" height="10" fill="#fff"  opacity="0.2">
        <animate attributeName="opacity" attributeType="XML" values="0.2; 1; .2" begin="0.15s" dur="0.6s" repeatCount="indefinite" />
        <animate attributeName="height" attributeType="XML" values="10; 20; 10" begin="0.15s" dur="0.6s" repeatCount="indefinite" />
        <animate attributeName="y" attributeType="XML" values="10; 5; 10" begin="0.15s" dur="0.6s" repeatCount="indefinite" />
      </rect>
      <rect x="16" y="10" width="4" height="10" fill="#fff"  opacity="0.2">
        <animate attributeName="opacity" attributeType="XML" values="0.2; 1; .2" begin="0.3s" dur="0.6s" repeatCount="indefinite" />
        <animate attributeName="height" attributeType="XML" values="10; 20; 10" begin="0.3s" dur="0.6s" repeatCount="indefinite" />
        <animate attributeName="y" attributeType="XML" values="10; 5; 10" begin="0.3s" dur="0.6s" repeatCount="indefinite" />
      </rect>
    </svg>

CSS


#lineLoader {
width:50px;
height:50px;
}