lucide/docs/guide/basics/examples/size-icon-font-example/icon.css

.my-icon {
  /* Icon size will relative to font-size of .text-wrapper */
  width: 1em;
  height: 1em;
}

.text-wrapper {
  /* Change this! */
  font-size: 96px;

  /* layout stuff */
  display: flex;
  gap: 0.25em;
  align-items: center;
}