<defs>
  <radialGradient
   id="rougeBleuRadial"
   cx="50%" cy="50%" r="50%" fx="50%" fy="50%">
	
   <stop
	offset="0%"
	stop-color="crimson"
	stop-opacity="1" />
	 
   <stop
	offset="100%"
	stop-color="deepSkyBlue"
	stop-opacity="1" />

  </radialGradient>					
</defs>


<circle cx="64" cy="64" r="40" fill="url(#rougeBleuRadial)"/>