how box shadow work css code example

Example: box shadow

/*// https://html-css-js.com/css/generator/box-shadow
--------------------------------------------------------------*/
-webkit-box-shadow: 5px 5px 15px 5px #000000;
   -moz-box-shadow: 5px 5px 15px 5px #000000;
		box-shadow: 5px 5px 15px 5px #000000;

/*//        offset-x | offset-y | blur-radius | spread-radius | color
box-shadow: 5px        5px       15px           5px             #000000;
--------------------------------------------------------------*/