CSS小计

/* offset-x | offset-y | color */
 box-shadow: 60px -16px teal;
/* offset-x | offset-y | blur-radius | color */
 box-shadow: 10px 5px 5px black; 
/* offset-x | offset-y | blur-radius | spread-radius | color */
 box-shadow: 2px 2px 2px 1px rgba(0, 0, 0, 0.2);
/* inset | offset-x | offset-y | color */
 box-shadow: inset 5em 1em gold;
/* Any number of shadows, separated by commas */
 box-shadow: 3px 3px red, -1em 0 0.4em olive;
/* Global keywords */
 box-shadow: inherit;
 box-shadow: initial;
 box-shadow: unset;