ReactGrid uses an expanded set of variables you can override.
Color related variables
Color variables
$primary-color: #3579f8 !default;
$bg-color: #ffffff !default;
$sticky-bg-color: #ffffff !default;
$shadow-color: #000000 !default;
$resize-line-color: #74b9ff !default;
$resize-hint-bg-color: $resize-line-color !default;
$resize-handle-gb-color: $primary-color !default;
$row-line-color: #e5e5e5 !default;
$col-line-color: #e5e5e5 !default;
$cell-editor-bg-color: #ffffff !default;
$cell-editor-border-color: $primary-color !default;
$fillhandle-action-border-color: #000000 !default;
$partial-area-gb-color: $primary-color !default;
$partial-area-border-color: $primary-color !default;
$checkbox-checked: $primary-color !default;
$checkbox-unchecked: #eeeeee !default;
$checkbox-hover: #cccccc !default;
$checkbox-mark: #ffffff !default;
Shadow variables
$shadow-blur-radius: 7px !default;
$shadow-spread-radius: -3px !default;
$shadow-length: 3px !default;
$cell-editor-shadow: 1px 1px 6px !default;
Context menu variables
$context-menu-shadow: 0px 0px 8px 2px !default;
Opacity variables
$opacity-80: 0.8 !default;
$opacity-35: 0.35 !default;
$opacity-20: 0.2 !default;
$opacity-15: 0.15 !default;
$opacity-10: 0.1 !default;
$opacity-01: 0.01 !default;
Size related variables
$cell-font-size: 1em !default;
$context-menu-font-size: 1em !default;
$row-separator-line-width: 1px !default;
$col-separator-line-width: 1px !default;
$cell-padding: 0 4px !default;
$cell-focus-border-width: 2px !default;
$celleditor-border-width: 2px !default;
$celleditor-padding-top: 1px !default;
$fill-handle-area: 40px !default;
$fill-handle-square: 6.5px !default;
$fill-handle-border-width: 1px !default;
$resize-handle-area: 11px !default;
$resize-handle-line-width: 6px !default;
$line-size: 2px !default;
$partial-area-border-width: 1px !default;
$partial-area-selected-border-width: 1px !default;
$checkbox-size: 18px !default;
$context-menu-option-padding: 8px 20px 8px 15px !default;
Core cell templates variables
$template-checkbox-size: 20px !default;
$template-font-size: 1em !default;
$template-bg-color: transparent !default;
$template-padding: 0 !default;
$template-margin: 0 !default;
$template-content-invalid: rgb(255, 0, 0) !default;