diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index 58f889f..0ab7dc0 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -31,6 +31,7 @@ RUN apt-get update && apt-get install -y \
   poppler-utils \
   potrace \
   python3-numpy \
+  python3-tinycss2 \
   resvg \
   texlive \
   texlive-fonts-recommended \
diff --git a/Dockerfile b/Dockerfile
index c7e4b35..4afb7ce 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -68,6 +68,7 @@ RUN apt-get update && apt-get install -y \
   poppler-utils \
   potrace \
   python3-numpy \
+  python3-tinycss2 \
   resvg \
   texlive \
   texlive-fonts-recommended \
@@ -108,4 +109,4 @@ EXPOSE 3000/tcp
 # used for calibre
 ENV QTWEBENGINE_CHROMIUM_FLAGS="--no-sandbox"
 ENV NODE_ENV=production
-ENTRYPOINT [ "bun", "run", "dist/src/index.js" ]
\ No newline at end of file
+ENTRYPOINT [ "bun", "run", "dist/src/index.js" ]