<div class="container">
  <div class="example">
    <div class="shadow shadow-1"></div>
    <pre>box-shadow: 1px 2px 3px 0 #FF9E9E;</pre>
  </div>

  <div class="example">
    <div class="shadow shadow-2"></div>
    <pre>box-shadow: 20px 20px 30px -10px #192824;</pre>
  </div>

  <div class="example">
    <div class="shadow shadow-3"></div>
    <pre>box-shadow: 1px 2px 10px 0 #555BFF inset;</pre>
  </div>
</div>

* {
  box-sizing: border-box;
}

body {
  background-color: #FFD913;
  font-family: sans-serif;
}

.container {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  margin-left: auto;
  margin-right: auto;
  margin-top: 40vh;
  margin-top: calc(50vh - 130px);
}

.example {
  background-color: white;
  flex-grow: 1;
  margin: 0.5em;
  min-width: 150px;
  border-radius: 10px;
}

.example .shadow {
  display: block;
  width: 100px;
  height: 100px;
  background-color: white;
  margin: 20% auto 10% auto;
  border-radius: 2px;
}

.example pre {
  width: 90%;
  background-color: #E4FFF7;
  padding: 1em;
  border-radius: 2px;
  margin-left: auto;
  margin-right: auto;
  white-space: pre-wrap;
}

.shadow-1 {
  box-shadow: 1px -3px 4px 0 #FF9E9E;
}

.shadow-2 {
  box-shadow: 20px 20px 30px -10px #192824;
}

.shadow-3 {
  box-shadow: 0 0 0 10px #555BFF inset;
}

@media screen and (max-width: 640px) {
  .container {
    flex-wrap: wrap;
    margin-top: 2vh;
  }
}