.wrapper {
  background: #ccc;
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
}

.card {
  margin: 2rem;
  width: 150px;
  height: 150px;
  background: #fff;
  border-radius: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: #ccc;
  font-size: 2rem;
  font-weight: 300;
}

.shadow-xs {
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.075);
}

.shadow-sm {
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05), 2px 6px 8px -5px rgba(0, 0, 0, 0.15);
}

.shadow-m {
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05), 4px 8px 15px -7px rgba(0, 0, 0, 0.1), 4px 8px 20px rgba(0, 0, 0, 0.1);
}

.shadow-lg {
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.1), 0 8px 8px rgba(0, 0, 0, 0.05), 4px 23px 40px -15px rgba(0, 0, 0, 0.15), 8px 30px 64px rgba(0, 0, 0, 0.1);
}

.shadow-xl {
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.05), 0 8px 8px rgba(0, 0, 0, 0.1), 0 16px 16px rgba(0, 0, 0, 0.1), 4px 32px 32px rgba(0, 0, 0, 0.05), 8px 50px 64px rgba(0, 0, 0, 0.15);
}