Modified cluster styling to have gradients

src/components/presentational/Map/DefsClusters.jsx

@@ -0,0 +1,13 @@
+import React from 'react'
+
+const DefsClusters = () => (
+  <defs>
+    <radialGradient id="myGradient">
+      <stop offset="10%" stop-color="red" />
+      <stop offset="95%" stop-color="black" />
+      {/* <stop offset="95%" stop-color="red" /> */}
+    </radialGradient>
+  </defs>
+)
+
+export default DefsClusters