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The editor’s UI is fully customizable through CSS. Every component uses data-re-* attributes as stable styling hooks, and a set of CSS custom properties (--re-*) control the entire color scheme.

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CSS variables

The default theme defines these CSS custom properties on :root. Override them on any parent element to restyle the editor: 
.my-editor {
  --re-bg: #1a1a2e;
  --re-text: #eaeaea;
  --re-border: #2a2a3e;
}

​
Color variables

VariableDescriptionLight defaultDark default
--re-bgBackground color#fff#1c1c1c
--re-borderBorder color#e5e5e5#2e2e2e
--re-textPrimary text color#1c1c1c#ececec
--re-text-mutedSecondary/muted text#6b6b6b#a0a0a0
--re-hoverHover backgroundrgba(0,0,0,0.04)rgba(255,255,255,0.06)
--re-activeActive/click backgroundrgba(0,0,0,0.06)rgba(255,255,255,0.09)
--re-pressedPressed/toggled backgroundrgba(0,0,0,0.06)rgba(255,255,255,0.09)
--re-separatorSeparator line color#e5e5e5#2e2e2e
--re-dangerDestructive action color#dc2626#f87171
--re-danger-hoverDestructive hover backgroundrgba(220,38,38,0.1)rgba(248,113,113,0.15)

​
Dimension variables

VariableDescriptionDefault
--re-radiusBorder radius for containers (menus, dropdowns)0.75rem
--re-radius-smBorder radius for buttons and items0.5rem
--re-shadowBox shadow for floating elements0 10px 15px -3px rgba(0,0,0,0.1), ...

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Dark mode

The default theme supports dark mode in two ways: Automatic — via prefers-color-scheme: 
@media (prefers-color-scheme: dark) {
  :root {
    --re-bg: #1c1c1c;
    --re-text: #ececec;
    /* ... dark values applied automatically */
  }
}
Class-based — via a .dark class on any ancestor: 
.dark {
  --re-bg: #1c1c1c;
  --re-text: #ececec;
  /* ... */
}
This works out of the box with class-based dark mode libraries (e.g., next-themes).

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Data attribute selectors

Every UI component uses data-re-* attributes as stable CSS hooks. These are the recommended way to target specific parts of the editor UI.

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Bubble menu

/* Menu container */
[data-re-bubble-menu] { }

/* Item groups (formatting, alignment) */
[data-re-bubble-menu-group] { }

/* Individual toggle buttons */
[data-re-bubble-menu-item] { }

/* Active/pressed state */
[data-re-bubble-menu-item][data-active] { }

/* Target a specific item by name */
[data-re-bubble-menu-item][data-item="bold"] { }
[data-re-bubble-menu-item][data-item="italic"] { }

/* Separator between groups */
[data-re-bubble-menu-separator] { }
Available data-item values: bold, italic, underline, strike, code, uppercase, align-left, align-center, align-right.

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Node selector

The block type dropdown inside the bubble menu: 
/* Dropdown wrapper */
[data-re-node-selector] { }

/* Trigger button (shows current block type) */
[data-re-node-selector-trigger] { }

/* Dropdown content panel */
[data-re-node-selector-content] { }

/* Individual block type option */
[data-re-node-selector-item] { }

/* Currently active block type */
[data-re-node-selector-item][data-active] { }
The link popover inside the bubble menu: 
/* Wrapper */
[data-re-link-selector] { }

/* Trigger button */
[data-re-link-selector-trigger] { }

/* Edit form container */
[data-re-link-selector-form] { }

/* URL input field */
[data-re-link-selector-input] { }

/* Apply button */
[data-re-link-selector-apply] { }

/* Unlink/remove button */
[data-re-link-selector-unlink] { }
The standalone menu that appears when clicking a link: 
/* Container */
[data-re-link-bm] { }

/* Toolbar with action buttons */
[data-re-link-bm-toolbar] { }

/* Action buttons */
[data-re-link-bm-item] { }
[data-re-link-bm-item][data-item="edit-link"] { }
[data-re-link-bm-item][data-item="open-link"] { }
[data-re-link-bm-item][data-item="unlink"] { }

/* Edit form */
[data-re-link-bm-form] { }
[data-re-link-bm-input] { }
[data-re-link-bm-apply] { }
[data-re-link-bm-unlink] { }

​
Button bubble menu

The menu that appears when clicking an email button: 
/* Container */
[data-re-btn-bm] { }

/* Toolbar */
[data-re-btn-bm-toolbar] { }

/* Action buttons */
[data-re-btn-bm-item] { }
[data-re-btn-bm-item][data-item="edit-link"] { }

​
Image bubble menu

The menu that appears when clicking an image: 
/* Container */
[data-re-img-bm] { }

/* Toolbar */
[data-re-img-bm-toolbar] { }

/* Action buttons */
[data-re-img-bm-item] { }
[data-re-img-bm-item][data-item="edit-link"] { }

​
Slash command

/* Command palette container */
[data-re-slash-command] { }

/* Individual command item */
[data-re-slash-command-item] { }

/* Currently highlighted item */
[data-re-slash-command-item][data-selected] { }

/* Category header (e.g., "Text", "Layout") */
[data-re-slash-command-category] { }

/* Empty state ("No results") */
[data-re-slash-command-empty] { }

​
Editor content classes

The editor content area uses the .tiptap root class from TipTap. Target content elements with .tiptap as a prefix:

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Typography

/* All editor content */
.tiptap { }

/* Headings */
.tiptap h1 { }
.tiptap h2 { }
.tiptap h3 { }

/* Paragraphs */
.tiptap p { }

/* Block quotes */
.tiptap blockquote { }

/* Horizontal rules */
.tiptap hr { }

/* Code */
.tiptap code { }       /* inline code */
.tiptap pre { }        /* code block */
.tiptap pre code { }   /* code inside block */

/* Lists */
.tiptap ul { }
.tiptap ol { }

​
Layout and structure

/* Column layouts */
.tiptap .node-columns { }
.tiptap .node-column { }

/* Sections */
.tiptap .node-section { }

/* Email buttons */
.tiptap .node-button { }

/* Links */
.tiptap .node-link { }

/* Placeholder text */
.tiptap .node-placeholder::before { }

​
Text alignment

The alignment attribute renders as an HTML attribute on block nodes: 
.tiptap [alignment="left"] { text-align: left; }
.tiptap [alignment="center"] { text-align: center; }
.tiptap [alignment="right"] { text-align: right; }

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Column data types

Column layouts also use data-type attributes: 
.tiptap [data-type="two-columns"] { }
.tiptap [data-type="three-columns"] { }
.tiptap [data-type="four-columns"] { }
.tiptap [data-type="column"] { }
.tiptap [data-type="section"] { }

​
Examples

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Custom brand colors

Override the CSS variables to match your brand: 
.my-editor {
  --re-bg: #fafaf9;
  --re-border: #d6d3d1;
  --re-text: #1c1917;
  --re-text-muted: #78716c;
  --re-hover: rgba(28, 25, 23, 0.04);
  --re-active: rgba(28, 25, 23, 0.08);
  --re-pressed: rgba(28, 25, 23, 0.08);
  --re-radius: 0.5rem;
  --re-radius-sm: 0.25rem;
}

<div className="my-editor">
  <EditorProvider extensions={extensions} content={content}>
    <BubbleMenu.Default />
  </EditorProvider>
</div>

​
Custom bubble menu item styles

Increase icon size and change the active state color: 
[data-re-bubble-menu-item] svg {
  width: 1rem;
  height: 1rem;
}

[data-re-bubble-menu-item][data-active] {
  background: #3b82f6;
  color: #fff;
}

​
Custom slash command appearance

Make the command palette wider with a custom background: 
[data-re-slash-command] {
  width: 320px;
  max-height: 400px;
  background: #f8fafc;
}

[data-re-slash-command-item][data-selected] {
  background: #e0f2fe;
}

[data-re-slash-command-category] {
  color: #64748b;
  font-size: 0.625rem;
}

​
Styling editor content

Customize how content looks inside the editor: 
/* Custom heading styles */
.tiptap h1 {
  font-size: 1.75rem;
  letter-spacing: -0.025em;
  color: #0f172a;
}

/* Custom blockquote */
.tiptap blockquote {
  border-left: 4px solid #3b82f6;
  background: #eff6ff;
  padding: 0.75rem 1rem;
  border-radius: 0.25rem;
}

/* Custom column gap */
.tiptap .node-columns {
  gap: 1rem;
}

/* Custom button appearance in the editor */
.tiptap .node-button {
  background: #2563eb;
  color: #fff;
  padding: 0.5rem 1.5rem;
  border-radius: 0.375rem;
  text-decoration: none;
}
Content styling in the editor (via .tiptap selectors) only affects how content looks while editing. The exported email HTML is styled separately via the Theming system.