how to use box shadow for contrusting table borders code example

Example 1: css shadow

.yourElement {
  /* offset-x | offset-y | blur-radius | spread-radius | color */
  -webkit-box-shadow: -2px -1px 15px 7px rgba(0,0,0,0.5);
  -moz-box-shadow: -3px -2px 30px 14px rgba(0,0,0,0.425);
  box-shadow: -4px -3px 45px 21px rgba(0,0,0,0.35);
}

Example 2: 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;
--------------------------------------------------------------*/