<defs>
  <linearGradient
   id="rougeBleu"
   x1="0%" y1="0%" x2="100%" y2="0%">
	
   <stop
	offset="0%"
	stop-color="crimson"
	stop-opacity="1" />
	 
   <stop
	offset="100%"
	stop-color="deepSkyBlue"
	stop-opacity="1" />

  </linearGradient>					
</defs>


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