metamask-extension/ui/components/app/modals/contract-details-modal/index.scss

.contract-details-modal {
  width: 100% !important;
  max-width: 408px;

  &__content {
    border-bottom: 1px solid var(--color-border-muted);

    &__contract {
      &__identicon {
        margin: 16px;
        box-shadow: none;
        background: none;
      }
    }
  }
}