SOURCE

<h2><code>阴影(5px 5px 10px #666)</code></h2>
<img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/123941/sports-q-c-1000-600-3.jpg">

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  text-align: center;
  margin: 20px auto;
  font-family: 'Roboto';
}

h2 {
  margin: 20px;
  padding-top: 20px;
  clear:both;
}

img {
  max-width: 80%;
  margin: 0 auto;
  padding: 2px;
  -webkit-filter: drop-shadow(5px 5px 10px #666);
  filter: drop-shadow(5px 5px 10px #666);
  border-radius: 10px;
}