.icon {
  -ms-flex-align: center;
      align-items: center;
  display: -ms-inline-flexbox;
  display: inline-flex;
  -ms-flex-pack: center;
      justify-content: center;
  height: 1.5rem;
  width: 1.5rem;
}
.icon.is-small {
  height: 1rem;
  width: 1rem;
}
.icon.is-medium {
  height: 2rem;
  width: 2rem;
}
.icon.is-large {
  height: 3rem;
  width: 3rem;
}