how do you add shadow to elements in css3 code example

Example 1: adding shadow to a div

/* CSS box shadow look like paper lift up*/
/* provide shadow to all four corners */
/* source - W3Schools.com */
 box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);

Example 2: box shadow css

#Box-shadow-example {
Box-shadow:0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);
}
<!-- offset-x, offset-y, (blur-radius and/or spread-radius=optional) and color-->

Example 3: Which CSS property is used to add shadow to an element?

"box-shadow" --"Text-shadow"_is_for_text_but_"box-shadow"_is_the_main_one--