metamask-extension/ui/components/app/info-box/index.scss

.info-box {
  border-radius: 4px;
  background-color: $alabaster;
  position: relative;
  padding: 16px;
  display: flex;
  flex-flow: column;
  color: $mid-gray;

  &__close::after {
    content: '\00D7';
    font-size: 29px;
    font-weight: 200;
    color: $dusty-gray;
    position: absolute;
    right: 12px;
    top: 0;
    cursor: pointer;
  }

  &__description {
    @include H7;
  }
}