diff --git a/packages/gitbook/src/lib/csp.ts b/packages/gitbook/src/lib/csp.ts
index 255341f7f..22503b8a7 100644
--- a/packages/gitbook/src/lib/csp.ts
+++ b/packages/gitbook/src/lib/csp.ts
@@ -7,7 +7,7 @@ export function getContentSecurityPolicy(): string {
     const csp = `
         default-src 'self' *;
         script-src 'self' 'unsafe-inline' 'unsafe-eval' *;
-        style-src 'self' 'unsafe-inline' *;
+        style-src 'self' 'unsafe-inline' blob: *;
         img-src * 'self' blob: data:;
         connect-src *;
         font-src *;