drop shadow effect colour in percentage in css code example

Example 1: css box shadow

/* offset-x | offset-y | blur-radius | spread-radius | color */
box-shadow: 2px 2px 2px 1px rgba(0, 0, 0, 0.2);

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-->