wagtail/client/scss/components/_whats-new.scss

.w-whats-new {
  margin-bottom: theme('spacing.16');

  &.w-dismissible--dismissed {
    display: none;
  }

  &__banner {
    position: relative;
    display: flex;
    align-items: center;
    border-radius: theme('borderRadius.md');
    padding: theme('spacing.6');
    background-color: theme('colors.warning.50');
    border: 5px solid transparent;
  }

  &__main-icon {
    .icon {
      color: theme('colors.warning.100');
      width: theme('spacing.10');
      height: theme('spacing.10');
      margin-inline-end: theme('spacing.4');
      border-radius: theme('borderRadius.full');

      @media (prefers-reduced-motion: no-preference) {
        animation: pulse-warning 5s 5;
      }
    }
  }

  &__heading {
    @apply w-h3;
    color: theme('colors.grey.600');
    margin-top: 0;
    margin-bottom: theme('spacing.2');
  }

  &__details {
    @apply w-body-text-large;
    margin-bottom: 0;
  }

  &__link {
    font-weight: theme('fontWeight.bold');
    color: theme('colors.secondary.400');
    text-decoration: underline;
    text-decoration-thickness: 2px;
    text-underline-offset: 3px;
  }

  &__dismiss {
    @apply -w-top-3 -w-right-3;
    position: absolute;
    padding: 0;
    background-color: transparent;

    .icon {
      border-radius: theme('borderRadius.full');
      width: theme('spacing.6');
      height: theme('spacing.6');
      background-color: theme('colors.white.DEFAULT');
      color: theme('colors.primary.DEFAULT');

      @media (forced-colors: active) {
        background-color: Canvas;
        color: CanvasText;
      }
    }
  }
}