blur css w3schools code example

Example 1: how to do a background blur in css

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

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

backdrop-filter: blur(10px);

Example 2: blur css

.mydiv { filter: grayscale(50%) }

/* Graut alle Bilder um 50% aus und macht sie um 10px unscharf */
img {
  filter: grayscale(0.5) blur(10px);
}