metamask-extension/ui/components/app/collectibles-items/index.scss

.collectibles-items {
  &__collection {
    margin-bottom: 24px;

    &-accordion-title {
      cursor: pointer;
    }

    &-image {
      width: 32px;
      height: 32px;
      border-radius: 50%;
    }

    &-image-alt {
      border-radius: 50%;
      width: 32px;
      height: 32px;
      padding: 8px;
      background: var(--ui-4);
      color: var(--ui-white);
      text-align: center;
      line-height: 1;
    }

    &-item-wrapper {
      align-self: center;
    }

    &-item {
      border-radius: 4px;
      width: 100%;
      display: flex;
      justify-content: center;
      cursor: pointer;
      align-self: center;
    }

    &-item-image {
      border-radius: 4px;
      width: 100%;
      height: 100%;
      cursor: pointer;
    }
  }
}