diff --git a/Dockerfile b/Dockerfile
index 23a06eb..e9ef483 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -16,6 +16,10 @@ COPY package.json package-lock.json ./
 RUN npm ci --no-audit --no-fund
 COPY vite.config.js ./
 COPY static/src ./static/src
+# Tailwind v4 scans these for utility-class usage at build time. They must be
+# present or the generated CSS omits every utility class (broken layout, giant
+# SVG icons). Paths mirror the @source directive in static/src/main.css.
+COPY vergabe_teilnahme/templates ./vergabe_teilnahme/templates
 RUN npm run build
 # Output: /build/static/dist/main.css
 
diff --git a/static/src/main.css b/static/src/main.css
index b042e87..bc4d68e 100644
--- a/static/src/main.css
+++ b/static/src/main.css
@@ -1,5 +1,12 @@
 @import "tailwindcss";
 
+/* Explicit content sources. Without these, Tailwind's automatic detection
+   depends on the build CWD finding the templates — which fails in the Docker
+   asset stage (it only copies static/src), producing a CSS with no utility
+   classes and badly oversized SVG icons. Keep these paths in sync with the
+   template dirs copied in the Dockerfile `assets` stage. */
+@source "../../vergabe_teilnahme/templates";
+
 @theme {
   --color-brand-50: #f0f4ff;
   --color-brand-100: #dce7ff;