Custom UI Colors
Release 3.2.2507+
Use CSS variables to freely customize editor UI colors. Works in modern browsers (Chrome, Edge, Safari, Firefox). Older browsers without CSS variable support (e.g. Internet Explorer) won't pick up these styles.
How to Configure
Override the variables in a <style> tag, scoped under the .se class:
<!-- index.html -->
<style>
.se {
--se-editor-border: #39b6b8; /* editor outer border */
--se-editor-contents-bg: #fdfdfd; /* editing area background */
--se-toolbar-fg: #4f898a; /* toolbar / resize bar icon & text */
--se-toolbar-bg: #f4f4f4; /* toolbar / resize bar background */
--se-toolbar-border: #39b6b8; /* toolbar / resize bar border */
--se-dialog-border: #4f898a; /* dialog & popup border */
}
</style>
Available CSS Variables
Variables are grouped by UI surface. Each screenshot highlights the part of the UI that the group controls.
Editor
--se-editor-border, --se-editor-contents-fg, --se-editor-contents-bg, --se-editor-shadow, --se-editor-header-shadow
Menu bar
--se-menu-bar-fg, --se-menu-bar-bg, --se-menu-bar-hover-bg, --se-menu-bar-active-bg, --se-menu-items-*
Toolbar / resize bar

--se-toolbar-fg, --se-toolbar-bg, --se-toolbar-border, --se-toolbar-active-bg, --se-toolbar-hover-bg, --se-toolbar-dropdown-menu-*
Tooltip
--se-tooltip-fg, --se-tooltip-bg, --se-tooltip-border, --se-tooltip-shadow
Dialog & popup
--se-dialog-title-fg, --se-dialog-tab-menu-*, --se-dialog-fg, --se-dialog-bg, --se-dialog-border, --se-dialog-button-*, --se-dialog-shadow
Dialog UI components
--se-ui-component-fg, --se-ui-component-bg, --se-ui-component-border, --se-ui-component-focus-border, --se-ui-component-placeholder, --se-ui-component-active-bg, --se-ui-component-hover-bg, --se-ui-component-point-*, --se-ui-component-menu-*
Ruler
--se-ruler-division, --se-ruler-number, --se-ruler-bg, --se-ruler-active-bg
Selection & mobile handle
--se-selection, --se-formula-selection, --se-multi-selection-bg, --se-multi-selection-border, --se-mobile-handle
Table handle
--se-table-handle-bar, --se-table-handle-bar-active, --se-table-handle-select-all, --se-table-handle-resize, --se-table-handle-text, --se-table-formula-label
Drawing object handle
--se-resize-handle-border, --se-resize-handle-dot, --se-resize-handle-rotation, --se-resize-handle-adj, --se-resize-handle-connector
Alt image / video
--se-alternative-image-fg, --se-alternative-image-bg, --se-alternative-image-border
Layer property button
--se-property-button-fg, --se-property-button-bg, --se-property-button-border