discourse/app/assets/stylesheets/common/components/d-icon-grid-picker.scss

// Custom properties for the grid layout, set on the DMenu/modal container.
// The DMenu identifier generates `.fk-d-menu.d-icon-grid-picker-content`
// which doesn't follow the BEM `__` pattern, so it stays outside the block.
.fk-d-menu.d-icon-grid-picker-content,
.fk-d-menu-modal.d-icon-grid-picker-content {
  z-index: z("modal", "dialog");

  --icon-grid-columns: 12;
  --icon-grid-cell: 36px;
  --icon-grid-gap: 2px;
  --icon-grid-h-padding: 0.5rem;
}

.d-icon-grid-picker {
  /* Apply icon color to the trigger icon when --icon-color is set */
  .fk-d-menu__trigger > .d-icon:not(.d-icon-grid-picker__caret) {
    color: var(--icon-color, currentColor);
  }

  .d-icon-grid-picker-trigger {
    gap: var(--space-1);
  }

  /* Split-button layout: DMenu trigger + clear button side by side */
  &.--has-clear {
    display: inline-flex;

    .fk-d-menu__trigger {
      border-top-right-radius: 0;
      border-bottom-right-radius: 0;
      border-right-color: transparent;
    }

    .d-icon-grid-picker__clear {
      border-top-left-radius: 0;
      border-bottom-left-radius: 0;
      border-left-color: transparent;
      margin-left: 0.1em;
      padding: 0.25em;
      min-width: 0;

      .d-icon {
        font-size: var(--font-down-2);
      }
    }
  }

  &__caret {
    font-size: var(--font-down-2);
  }

  &__content {
    display: flex;
    flex-direction: column;
    width: calc(
      var(--icon-grid-columns) * var(--icon-grid-cell) +
        (var(--icon-grid-columns) - 1) * var(--icon-grid-gap) +
        var(--icon-grid-h-padding) * 2 + 8px
    );
    max-height: 380px;
  }

  // Mirrors emoji-picker__filter-container
  &__filter-container {
    background: var(--primary-very-low);
    display: flex;
    height: 50px;
  }

  // Mirrors emoji-picker__filter
  &__filter {
    width: 100%;
    margin: 0.5rem;
    border-radius: var(--d-border-radius);
    box-sizing: border-box;

    input {
      background-color: transparent !important;
      width: 100%;
    }

    .d-icon {
      color: var(--primary-medium);
    }

    &.filter-input-container {
      border-color: transparent;
      background: var(--secondary);
    }
  }

  // Parent grid that both favorites and icon grid share
  &__grid-wrapper {
    display: grid;
    grid-template-columns: repeat(
      var(--icon-grid-columns),
      var(--icon-grid-cell)
    );
    gap: var(--icon-grid-gap);
    padding: var(--icon-grid-h-padding);
    overflow-x: hidden;
    overflow-y: auto;
    max-height: 300px;
    scrollbar-width: thin;
    box-sizing: border-box;
  }

  // Favorites row inherits parent columns via subgrid
  &__favorites {
    display: grid;
    grid-template-columns: subgrid;
    grid-column: 1 / -1;
    padding-bottom: 0.25rem;
  }

  &__selected-name {
    font-size: var(--font-down-1);
    white-space: nowrap;
    padding-left: 0.3em;
    padding-right: 0.5em;
  }

  // Main icon grid inherits parent columns via subgrid
  &__grid {
    display: grid;
    grid-template-columns: subgrid;
    grid-column: 1 / -1;
  }

  &__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: var(--icon-grid-cell);
    height: var(--icon-grid-cell);
    cursor: pointer;
    color: var(--icon-color, var(--primary-high));
    border: none;
    background: none;
    padding: 0;
    font: inherit;

    @media (prefers-reduced-motion: no-preference) {
      transition: transform 0.15s ease;
    }

    &:hover,
    &:focus {
      background: var(--primary-very-low);
      border-radius: var(--d-border-radius);

      @media (prefers-reduced-motion: no-preference) {
        transform: scale(1.25);
      }
    }

    &.--selected {
      background: var(--tertiary-low);
      color: var(--tertiary);
      border-radius: var(--d-border-radius);
    }

    // Inner grid so the chip icon aligns with the first grid column
    &.d-icon-grid-picker__selected-chip {
      display: grid;
      grid-template-columns: var(--icon-grid-cell) 1fr;
      align-items: center;
      text-align: left;
      padding: 0;

      // The chip spans multiple columns, so transform: scale() on the
      // whole element would overlap neighbouring cells without triggering
      // a grid reflow. Scale only the inner icon instead.
      &:hover,
      &:focus {
        transform: none;

        @media (prefers-reduced-motion: no-preference) {
          .d-icon {
            transform: scale(1.25);
          }
        }
      }

      .d-icon {
        justify-self: center;

        @media (prefers-reduced-motion: no-preference) {
          transition: transform 0.15s ease;
        }
      }
    }

    .d-icon {
      font-size: var(--font-up-2);
    }
  }

  &__loading {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 150px;
    grid-column: 1 / -1;
  }

  &__empty {
    padding: 1em;
    text-align: center;
    color: var(--primary-medium);
    grid-column: 1 / -1;
  }
}

// Mobile overrides
@media screen and (width <= 767px) {
  .fk-d-menu-modal.d-icon-grid-picker-content {
    .d-modal__body {
      padding: 0;
    }

    .d-icon-grid-picker {
      &__content {
        width: 100%;
      }

      &__filter-container {
        width: 100%;
      }

      &__grid-wrapper {
        width: 100%;
        grid-template-columns: repeat(auto-fill, var(--icon-grid-cell));
        justify-content: center;
        max-height: calc(
          var(--composer-vh, 1dvh) * 100 - 50px - env(safe-area-inset-bottom)
        );
      }
    }
  }
}