Hello guys, how do you make a website background photo blur?

Question

-webkit-filter: blur(5px);
-moz-filter: blur(5px);
-o-filter: blur(5px);
-ms-filter: blur(5px);
filter: blur(5px);

Tried this earlier and it made the contents blur instead of the web background photo

Answer 1

https://stackoverflow.com/a/20039965/6686252