<div class="container">
  <div class="element element-1">
    <p>
      My one-side shadow is at the bottom. The shadow is offsetted to the bottom using a positive vertical offset.
    </p>
  </div>
  <div class="element element-2">
    <p>
      My one-side shadow is at left. The shadow is offsetted to the left using a negative horizontal offset.
    </p>
  </div>
  <div class="element element-3">
    <p>
      My one-side shadow is at right. The shadow is offsetted to the right using a positive horizontal offset.
    </p>
  </div>
</div>
body {
  background-color: #F5F5F5;
  color: #555;
  font-size: 1.1em;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

.container {
  margin: 40px auto;
  width: 90%;
}

.element {
  padding: 20px;
  background-color: white;
  color: #222;
  margin-top: 70px;
  height: 200px;
  border: 10px solid #976fad;
}

.element-1 {
  box-shadow: 0 30px 10px -20px rgba(0, 0, 0, 0.8);
}

.element-2 {
  box-shadow: -30px 0 10px -20px rgba(0, 0, 0, 0.8);
}

.element-3 {
  box-shadow: 30px 0 10px -20px rgba(0, 0, 0, 0.8);
}