app/icons/three-dots.svg

<!-- By Sam Herbert (@sherb), for everyone. More @ http://goo.gl/7AJzbL -->
<svg width="30" height="14" viewBox="0 0 120 30" xmlns="http://www.w3.org/2000/svg" fill="#fff">
    <circle cx="15" cy="15" r="15" fill="var(--primary, red)">
        <animate attributeName="r" from="15" to="15"
            begin="0s" dur="0.8s"
            values="15;9;15" calcMode="linear"
            repeatCount="indefinite" />
        <animate attributeName="fill-opacity" from="1" to="1"
            begin="0s" dur="0.8s"
            values="1;.5;1" calcMode="linear"
            repeatCount="indefinite" />
    </circle>
    <circle cx="60" cy="15" r="9" fill-opacity="0.3" fill="var(--primary, red)">
        <animate attributeName="r" from="9" to="9"
            begin="0s" dur="0.8s"
            values="9;15;9" calcMode="linear"
            repeatCount="indefinite" />
        <animate attributeName="fill-opacity" from="0.5" to="0.5"
            begin="0s" dur="0.8s"
            values=".5;1;.5" calcMode="linear"
            repeatCount="indefinite" />
    </circle>
    <circle cx="105" cy="15" r="15" fill="var(--primary, red)">
        <animate attributeName="r" from="15" to="15"
            begin="0s" dur="0.8s"
            values="15;9;15" calcMode="linear"
            repeatCount="indefinite" />
        <animate attributeName="fill-opacity" from="1" to="1"
            begin="0s" dur="0.8s"
            values="1;.5;1" calcMode="linear"
            repeatCount="indefinite" />
    </circle>
</svg>