<div class="container">
  <div class="box-shadow"></div>
</div>
.box-shadow {
  height: 50px;
  width: 50px;
  background-color: #f9cb30;
  box-shadow: 100px 50px 0 0 #333;
}

.container {
  width: 90%;
  margin: 30px auto;
}

External CSS

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External JavaScript

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