多個陰影
JSFiddle: https ://jsfiddle.net/UnsungHero97/80qod7aL/5/
HTML
<div class="box_shadow"></div>
CSS
.box_shadow {
width: 100px;
height: 100px;
margin: 100px;
box-shadow:
-52px -52px 0px 0px #f65314,
52px -52px 0px 0px #7cbb00,
-52px 52px 0px 0px #00a1f1,
52px 52px 0px 0px #ffbb00;
}