metamask-extension/ui/components/multichain/connected-site-menu/index.scss

.multichain-connected-site-menu {
  height: 24px;
  width: 24px;
  padding: 0;

  &__badge {
    height: 12px;
    width: 12px;
  }

  &__badge.not-connected {
    height: 8px;
    width: 8px;
  }

  &__badge.not-connected::after {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: var(--color-background-default);
    z-index: -1;
    border-radius: 50%;
  }
}