Module:Self/styles.css

.wp-tmpl-self-license-wrapper {
  background-color: var(--background-color-interactive-subtle, #f0f0f0);
  border: 2px solid var(--border-color-interactive, #aaa);
  color: var(--color-base, #000);
  margin: 0.5em auto;
  padding: 2px;
  width: 90%;
}