how to blur background color in css

background: rgba(255,255,255,0.5);
backdrop-filter: blur(5px);

/* Answer to "blur behind element css" */

/*
	This blurs everything behind the element it's applied to
*/

backdrop-filter: blur(10px);

  filter: blur(8px);
  -webkit-filter: blur(8px);

backdrop-filter: blur(5px);