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HTML

            
              <div>
  <h1>Happy</h1>
  <p>Lorem ipsum dolor sit amet!</p>
</div>

<div class="filtered">
  <h1>Halloween</h1>
  <p>Lorem ipsum dolor sit amet!</p>
</div>
            
          
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CSS

            
              body { background: #eee; font-family: sans-serif; }
div {
  position: relative;
  float: left;
  width: 23em;
  margin: 1em;
  padding: .5em;
  background-color: #fff;
  border-radius: 6px;
  box-shadow: 0 0 6px rgba(0,0,0,.5);
  font-size: .875em;
  &:after {
    content: '\00a0';
    position: absolute;
    left: 1em;
    bottom: -12px; /* Needs to match border size */
    width: 0;
    height: 0;
    border-top: 12px solid #fff;
    border-left: 12px solid transparent;
    border-right: 12px solid transparent;
  }
  h1, p { margin: 0; }
  h1 { font-size: 1em; }
}

.filtered {
  box-shadow: none;
  -webkit-filter: drop-shadow(0 0 3px rgba(0,0,0,.5));
  -moz-filter: drop-shadow(0 0 3px rgba(0,0,0,.5));
  filter: drop-shadow(0 0 3px rgba(0,0,0,.5));
}
  
            
          
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JS

            
              
            
          
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