Add drop shadow css

Css shadow

.yourElement {
  /* offset-x | offset-y | blur-radius | spread-radius | color */
  -webkit-box-shadow: -2px -1px 15px 7px rgba(0,0,0,0.5);
  -moz-box-shadow: -3px -2px 30px 14px rgba(0,0,0,0.425);
  box-shadow: -4px -3px 45px 21px rgba(0,0,0,0.35);
}

Drop shadow css

filter: drop-shadow(30px 10px 4px #4444dd);
drop-shadow(offset-x offset-y blur-radius color)

Drop shadow image css

filter: drop-shadow(0px 10px 3px black);

Add drop shadow css

filter: drop-shadow(x-offset,  y-offset, blur, color);

Creating drop shadow css

<html>
<style type="text/css">
.box {
     position: relative;
     width: 400px;
     height: 300px;
     background-color: #fff;
     box-shadow: 0 1px 5px rgba(0,0,0,0.25), 0 0 50px rgba(0,0,0,0.1) inset;
     border-radius: 1%     1%     1%     1% /     1%     1%     1%     1%;
}
.box:after {
      position: absolute;
      width: 64%;
      height: 12%;
      left: 18%;
      border-radius: 50%;
      z-index: -1;
      bottom: 0%;
      content: "";
      box-shadow: 0 50px 24px rgba(0,0,0,0.24);
}
</style>
<body>
    <div class="box">
    <img src="img.jpg" />
    </div>
</body>
<html>

Source: stackoverflow.com

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