diff --git a/packages/ui/src/pierre/index.ts b/packages/ui/src/pierre/index.ts
index f83fc82a2..824d96b11 100644
--- a/packages/ui/src/pierre/index.ts
+++ b/packages/ui/src/pierre/index.ts
@@ -10,6 +10,31 @@ export type DiffProps<T = {}> = FileDiffOptions<T> & {
 }
 
 const unsafeCSS = `
+[data-diffs] {
+  --diffs-bg: light-dark(var(--diffs-light-bg), var(--diffs-dark-bg));
+  --diffs-bg-buffer: var(--diffs-bg-buffer-override, light-dark( color-mix(in lab, var(--diffs-bg) 92%, var(--diffs-mixer)), color-mix(in lab, var(--diffs-bg) 92%, var(--diffs-mixer))));
+  --diffs-bg-hover: var(--diffs-bg-hover-override, light-dark( color-mix(in lab, var(--diffs-bg) 97%, var(--diffs-mixer)), color-mix(in lab, var(--diffs-bg) 91%, var(--diffs-mixer))));
+  --diffs-bg-context: var(--diffs-bg-context-override, light-dark( color-mix(in lab, var(--diffs-bg) 98.5%, var(--diffs-mixer)), color-mix(in lab, var(--diffs-bg) 92.5%, var(--diffs-mixer))));
+  --diffs-bg-separator: var(--diffs-bg-separator-override, light-dark( color-mix(in lab, var(--diffs-bg) 96%, var(--diffs-mixer)), color-mix(in lab, var(--diffs-bg) 85%, var(--diffs-mixer))));
+  --diffs-fg: light-dark(var(--diffs-light), var(--diffs-dark));
+  --diffs-fg-number: var(--diffs-fg-number-override, light-dark(color-mix(in lab, var(--diffs-fg) 65%, var(--diffs-bg)), color-mix(in lab, var(--diffs-fg) 65%, var(--diffs-bg))));
+  --diffs-deletion-base: var(--diffs-deletion-color-override, light-dark(var(--diffs-light-deletion-color, var(--diffs-deletion-color, rgb(255, 0, 0))), var(--diffs-dark-deletion-color, var(--diffs-deletion-color, rgb(255, 0, 0)))));
+  --diffs-addition-base: var(--diffs-addition-color-override, light-dark(var(--diffs-light-addition-color, var(--diffs-addition-color, rgb(0, 255, 0))), var(--diffs-dark-addition-color, var(--diffs-addition-color, rgb(0, 255, 0)))));
+  --diffs-modified-base: var(--diffs-modified-color-override, light-dark(var(--diffs-light-modified-color, var(--diffs-modified-color, rgb(0, 0, 255))), var(--diffs-dark-modified-color, var(--diffs-modified-color, rgb(0, 0, 255)))));
+  --diffs-bg-deletion: var(--diffs-bg-deletion-override, light-dark( color-mix(in lab, var(--diffs-bg) 98%, var(--diffs-deletion-base)), color-mix(in lab, var(--diffs-bg) 92%, var(--diffs-deletion-base))));
+  --diffs-bg-deletion-number: var(--diffs-bg-deletion-number-override, light-dark( color-mix(in lab, var(--diffs-bg) 91%, var(--diffs-deletion-base)), color-mix(in lab, var(--diffs-bg) 85%, var(--diffs-deletion-base))));
+  --diffs-bg-deletion-hover: var(--diffs-bg-deletion-hover-override, light-dark( color-mix(in lab, var(--diffs-bg) 80%, var(--diffs-deletion-base)), color-mix(in lab, var(--diffs-bg) 75%, var(--diffs-deletion-base))));
+  --diffs-bg-deletion-emphasis: var(--diffs-bg-deletion-emphasis-override, light-dark(rgb(from var(--diffs-deletion-base) r g b / 0.7), rgb(from var(--diffs-deletion-base) r g b / 0.1)));
+  --diffs-bg-addition: var(--diffs-bg-addition-override, light-dark( color-mix(in lab, var(--diffs-bg) 98%, var(--diffs-addition-base)), color-mix(in lab, var(--diffs-bg) 92%, var(--diffs-addition-base))));
+  --diffs-bg-addition-number: var(--diffs-bg-addition-number-override, light-dark( color-mix(in lab, var(--diffs-bg) 91%, var(--diffs-addition-base)), color-mix(in lab, var(--diffs-bg) 85%, var(--diffs-addition-base))));
+  --diffs-bg-addition-hover: var(--diffs-bg-addition-hover-override, light-dark( color-mix(in lab, var(--diffs-bg) 80%, var(--diffs-addition-base)), color-mix(in lab, var(--diffs-bg) 70%, var(--diffs-addition-base))));
+  --diffs-bg-addition-emphasis: var(--diffs-bg-addition-emphasis-override, light-dark(rgb(from var(--diffs-addition-base) r g b / 0.07), rgb(from var(--diffs-addition-base) r g b / 0.1)));
+  --diffs-selection-base: var(--diffs-modified-base);
+  --diffs-selection-number-fg: light-dark( color-mix(in lab, var(--diffs-selection-base) 65%, var(--diffs-mixer)), color-mix(in lab, var(--diffs-selection-base) 75%, var(--diffs-mixer)));
+  --diffs-bg-selection: var(--diffs-bg-selection-override, light-dark( color-mix(in lab, var(--diffs-bg) 82%, var(--diffs-selection-base)), color-mix(in lab, var(--diffs-bg) 75%, var(--diffs-selection-base))));
+  --diffs-bg-selection-number: var(--diffs-bg-selection-number-override, light-dark( color-mix(in lab, var(--diffs-bg) 75%, var(--diffs-selection-base)), color-mix(in lab, var(--diffs-bg) 60%, var(--diffs-selection-base))));
+}
+
 [data-diffs-header],
 [data-diffs] {
   [data-separator-wrapper] {