metamask-extension/ui/components/app/flask/snap-ui-renderer/index.scss

.snap-ui-renderer {
  &__error {
    margin-top: 0 !important;
  }

  &__spinner {
    width: 30px;
  }

  &__divider {
    width: 100%;
  }

  &__panel {
    height: 100%;
  }

  &__content > *:first-child {
    margin-top: 0;
  }

  &__content > &__panel > *:first-child {
    margin-top: 0;
  }

  &__content > *:last-child {
    margin-bottom: 0;
  }

  &__content > &__panel > *:last-child {
    margin-bottom: 0;
  }
}