discourse/app/assets/stylesheets/common/base/emoji.scss

img.emoji {
  width: 20px;
  height: 20px;
  vertical-align: text-bottom;

  h1 &,
  h2 &,
  h3 &,
  h4 &,
  h5 &,
  h6 & {
    vertical-align: middle;
  }
}

img.emoji.only-emoji {
  width: 32px;
  height: 32px;
  margin: 0.5em 0;
}

a,
.md-table,
.poll {
  img.emoji.only-emoji {
    width: 20px;
    height: 20px;
    margin: 0;
  }
}

small img.emoji,
sub img.emoji,
sup img.emoji {
  height: 1.1em;
  width: 1.1em;
}

.emoji-picker {
  width: 100%;
  color: var(--primary);
  background-color: var(--secondary);
  border: 1px solid var(--primary-low);
  display: flex;
  box-sizing: border-box;
  background-clip: padding-box;
  z-index: z("modal", "content");
  flex-direction: row;
  height: 320px;
  max-height: 50vh;
  max-width: 420px;

  img.emoji {
    // custom emojis might import images of various sizes
    // we don't want them to be deformed in the picker
    width: 20px !important;
    height: 20px !important;
  }

  .emoji-picker-content {
    display: flex;
    flex-direction: column;
    flex: 20;
  }

  .emoji-picker-emoji-area {
    overflow-y: scroll;
    -webkit-overflow-scrolling: touch;
    width: 100%;
    box-sizing: border-box;
    padding: 0.25em;
    padding-left: 0.75em;
    height: 100%;
    background: var(--secondary);

    .section {
      margin: 0 0 1em;

      .trash-recent {
        background: none;
        font-size: var(--font-down-1);

        &:hover .d-icon {
          color: var(--danger-hover);
        }
      }
    }

    .section-header {
      font-weight: 900;
      padding: 0.25em 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .section-group,
    .results {
      display: flex;
      flex-wrap: wrap;
      img.emoji {
        padding: 0.25em 0.28em;
        cursor: pointer;
        margin: 0;
        display: inline-flex;

        &:hover,
        &:focus {
          background: var(--tertiary-low);
          border-radius: 3px;
        }
      }
    }

    .results {
      padding: 0.25em 0;

      &:empty {
        display: none;
      }
    }
  }

  .emoji-picker-category-buttons {
    overflow-y: auto;
    width: 50px;
    padding-left: 0.5em;
    display: flex;
    flex-wrap: wrap;
    border-right: 1px solid var(--primary-low);

    .category-button {
      background: none;
      border: none;
      padding: 0.5em;
      outline: none;

      .emoji {
        pointer-events: none;
        filter: grayscale(100%);
      }

      &:hover .emoji,
      &.current .emoji {
        filter: grayscale(0);
      }
    }
  }

  &.has-filter {
    .emojis-container {
      visibility: hidden;
      height: 0px;
      overflow: hidden;
    }

    .emoji-picker-category-buttons {
      pointer-events: none;
      opacity: 0.5;
      .category-button.current .emoji {
        filter: grayscale(100%);
      }
    }
  }
}

.emoji-picker-search-container {
  display: flex;
  width: 100%;
  position: relative;
  padding: 0.75em;
  border-bottom: 1px solid var(--primary-low);
  box-sizing: border-box;
  align-items: center;

  .filter {
    flex: 1 0 auto;
    margin: 0;
    width: calc(100% - 50px);
    margin-right: 0.5em;
  }

  .d-icon {
    color: var(--primary-medium);
    cursor: pointer;
    padding: 0.25em;
    &:hover {
      color: var(--tertiary);
    }
  }
}

.emoji-picker-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--primary-low);
}

.emoji-picker-emoji-info {
  display: flex;
  align-items: center;
  padding-left: 0.5em;

  img.emoji {
    height: 32px !important;
    width: 32px !important;
  }
}

.emoji-picker-diversity-picker {
  border: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 0.5em;

  .diversity-scale {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: auto;
    border-radius: 3px;
    margin: 0.15em;
    height: 24px;
    width: 24px;

    .d-icon {
      color: #fff;
      filter: drop-shadow(0.5px 1.5px 0 rgba(0, 0, 0, 0.3));
    }
  }

  .diversity-scale.default {
    background: #ffcc4d;
  }
  .diversity-scale.light {
    background: #f7dece;
  }
  .diversity-scale.medium-light {
    background: #f3d2a2;
  }
  .diversity-scale.medium {
    background: #d5ab88;
  }
  .diversity-scale.medium-dark {
    background: #af7e57;
  }
  .diversity-scale.dark {
    background: #7c533e;
  }
}

.emoji-picker-modal-overlay {
  z-index: z("modal", "overlay");
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  opacity: 0.8;
  background-color: var(--primary);
}