discourse/app/assets/stylesheets/common/d-editor.scss

.d-editor-container {
  display: flex;
  flex-grow: 1;
  max-width: 100%;
}

.d-editor {
  display: flex;
  flex-grow: 1;
  min-height: 0;
}

.d-editor-textarea-column {
  display: flex;
  flex: 1;
  flex-direction: column;
  max-width: 100%;
  min-width: 0;
}

.d-editor-textarea-wrapper {
  display: flex;
  flex: 1;
  flex-direction: column;
  background-color: var(--secondary);
  position: relative;
  border: 1px solid var(--primary-400);
  border-radius: var(--d-input-border-radius);
  min-height: 0;

  textarea {
    background: transparent;
  }

  &.in-focus {
    @include default-focus;

    textarea {
      outline: 0;
    }
  }

  &.disabled {
    cursor: not-allowed;
    .d-editor-button-bar {
      opacity: 0.5;
      pointer-events: none;
    }
  }
}

.d-editor-preview-wrapper {
  display: flex;
  flex: 1;
  flex-direction: column;
  margin-left: 16px;
  overflow: auto;
  overflow-anchor: none;
  cursor: default;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}

.d-editor-input,
.d-editor-preview {
  box-sizing: border-box;
  flex: 1 1 100%;
  width: 100%;
  margin: 0;
  min-height: auto;
  word-wrap: break-word;
  -webkit-appearance: none;
  border-radius: 0;
}

.d-editor-input {
  border: 0;
  padding: 10px;
  height: 100%;
  overflow-x: hidden;
  overscroll-behavior: contain;
  overflow-anchor: none;
  resize: none;
}

.d-editor-preview {
  height: auto;
}

.d-editor-plugin {
  display: flex;
  flex: 1 1;
  overflow: auto;
}

.composing-whisper .d-editor-preview {
  font-style: italic;
  color: var(--primary-medium) !important;
}

.hide-preview .d-editor-preview-wrapper {
  display: none;
  flex: 0;
}

.edit-category-tab-topic-template {
  .emoji.btn {
    display: none;
  }
}

.user-preferences .bio-composer,
.group-form-bio,
.edit-category-tab-topic-template {
  textarea {
    width: 100%;
    height: 100%;
    min-height: 10em;
  }
  .local-dates.btn {
    display: none;
  }
  .d-editor-container {
    display: block;
  }
  .d-editor-textarea-wrapper {
    border: 1px solid var(--primary-low);
  }
  .d-editor-preview-wrapper {
    max-width: 100%;
    margin: 0;
    padding: 0;
  }
  .d-editor-preview {
    background-color: var(--primary-very-low);
    margin-top: 1em;
    padding: 0.667em;
    &:empty {
      margin: 0;
      padding: 0;
    }
  }
}

.user-preferences .bio-composer,
.group-form-bio {
  padding: 10px;
  border: 1px solid var(--primary-low);
}

.d-editor-preview img {
  vertical-align: baseline; // consistent with cooked
  &.emoji,
  &.avatar,
  &.onebox-avatar,
  &.site-icon {
    vertical-align: text-bottom;
  }
  &.resizable {
    object-fit: cover;
    object-position: top;
  }
}

.d-editor-preview .image-wrapper {
  --resizer-height: 2.25em;
  position: relative;
  display: inline-block;
  padding-bottom: var(--resizer-height);

  .button-wrapper {
    box-sizing: border-box;
    padding: 0.25em 0.5em;
    min-width: 19em; // wide enough to contain all controls
    width: 100%;
    display: flex;
    flex-wrap: nowrap;
    align-items: center;
    gap: 0 0.5em;
    position: absolute;
    height: var(--resizer-height);
    bottom: 0;
    left: 0;
    opacity: 0.9;
    z-index: 1; // needs to be higher than image
    background: var(--secondary);
    color: var(--primary);

    .scale-btn-container,
    .alt-text-readonly-container,
    .alt-text-edit-container,
    .delete-image-button {
      display: flex;
      height: var(--resizer-height);
      align-items: center;

      &[hidden] {
        display: none;
      }
    }

    .scale-btn {
      color: var(--tertiary);
      padding: 0 1em;

      &:first-child,
      &:last-child {
        padding: 0;
      }

      &.active {
        font-weight: bold;
        color: var(--primary);
      }

      &:not(.active):hover {
        text-decoration: underline;
        cursor: pointer;
      }
    }

    .alt-text-readonly-container {
      flex: 1 1 auto;
      // arbitrary min-width value allows for correct shrinking
      min-width: 100px;

      .alt-text {
        margin-right: 0.5em;
        overflow: hidden;
        white-space: nowrap;
        text-overflow: ellipsis;
      }

      .alt-text-edit-btn {
        cursor: pointer;
        color: var(--tertiary);

        svg {
          padding-right: 0.5em;
        }
      }
    }

    .alt-text-edit-container {
      gap: 0 0.25em;
      flex: 1;
      max-width: 100%;
      height: 95%; // gives input some padding
      .alt-text-input,
      .alt-text-edit-ok,
      .alt-text-edit-cancel {
        height: 100%;
      }

      .alt-text-input {
        display: inline-flex;
        flex: 1;
        overflow: hidden;
        white-space: nowrap;
        text-overflow: ellipsis;
        margin: 0;
        padding-left: 0.25em;
      }

      .alt-text-edit-ok,
      .alt-text-edit-cancel {
        border: none;
        width: var(--resizer-height);

        svg {
          margin: 0;
        }
      }
    }

    .delete-image-button {
      cursor: pointer;
      color: var(--danger);

      .d-icon-trash-can {
        margin-left: 0.5em;
      }
    }

    .wrap-image-grid-button {
      cursor: pointer;
      color: var(--tertiary);
    }

    svg {
      pointer-events: none;
    }
  }
}

// d-editor bar button sizing
.d-editor-button-bar {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(2.35em, 1fr));
  @include breakpoint(tablet) {
    // occupy available space on narrower screens
    grid-template-columns: repeat(auto-fit, minmax(2em, 1fr));
  }
  @include breakpoint(mobile-medium) {
    font-size: var(--font-down-1);
  }
  align-items: center;
  border-bottom: 1px solid var(--primary-low);
  width: 100%;
  box-sizing: border-box;
  flex-shrink: 0;

  .btn:focus {
    @include default-focus;
  }

  .btn {
    margin: 0;
    background-color: transparent;
    color: var(--primary-medium);

    .d-icon {
      color: currentColor;
    }
    .discourse-no-touch & {
      &:hover {
        color: var(--primary-low);
      }
    }
  }

  .select-kit-header-wrapper {
    justify-content: center;
  }
}

.d-editor #form-template-form {
  overflow: auto;
  background: var(--primary-very-low);
  padding: 1rem;
  border: 1px solid var(--primary-400);
  margin-bottom: 0;
  height: 100%;
}