how to use filter blur in css code example

Example 1: image blur css

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

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);
}