marimo-team · mscolnick · Aug 30, 2024 · Aug 30, 2024
diff --git a/frontend/index.html b/frontend/index.html
@@ -60,7 +60,6 @@
     <marimo-app-config data-config='{{ app_config }}' hidden></marimo-app-config>
     <marimo-server-token data-token='{{ server_token }}' hidden></marimo-server-token>
     <title>{{ title }}</title>
-    <link rel="stylesheet" crossorigin href="/custom.css" />
   </head>
   <body>
     <div id="root"></div>

diff --git a/marimo/_server/api/endpoints/assets.py b/marimo/_server/api/endpoints/assets.py
@@ -4,7 +4,7 @@
 import mimetypes
 import os
 import re
-from typing import TYPE_CHECKING, Optional
+from typing import TYPE_CHECKING
 
 from starlette.authentication import requires
 from starlette.exceptions import HTTPException
@@ -15,7 +15,6 @@
 from marimo._config.manager import UserConfigManager
 from marimo._runtime.virtual_file import EMPTY_VIRTUAL_FILE, read_virtual_file
 from marimo._server.api.deps import AppState
-from marimo._server.file_router import MarimoFileKey
 from marimo._server.router import APIRouter
 from marimo._server.templates.templates import (
     home_page_template,
@@ -91,25 +90,6 @@ async def index(request: Request) -> HTMLResponse:
     return HTMLResponse(html)
 
 
-# This serves the custom.css file if it was
-# supplied in the app config
-@router.get("/custom.css")
-@requires("read")
-def custom_css(request: Request) -> Response:
-    app_state = AppState(request)
-    file_key: Optional[MarimoFileKey] = (
-        app_state.query_params(FILE_QUERY_PARAM_KEY)
-        or app_state.session_manager.file_router.get_unique_file_key()
-    )
-
-    if not file_key:
-        return Response("", media_type="text/css")
-
-    app_manager = app_state.session_manager.app_manager(file_key)
-    css = app_manager.read_css_file() or ""
-    return Response(css, media_type="text/css")
-
-
 STATIC_FILES = [
     r"(favicon\.ico)",
     r"(circle-check\.ico)",

diff --git a/marimo/_server/templates/templates.py b/marimo/_server/templates/templates.py
@@ -65,6 +65,14 @@ def notebook_page_template(
         "{{ mode }}",
         "read" if mode == SessionMode.RUN else "edit",
     )
+    # If has custom css, inline the css and add to the head
+    if app_config.css_file:
+        css_contents = read_css_file(app_config.css_file, filename=filename)
+        if css_contents:
+            css_contents = f"<style>{css_contents}</style>"
+            # Append to head
+            html = html.replace("</head>", f"{css_contents}</head>")
+
     return html
 
 
@@ -167,7 +175,7 @@ def static_notebook_template(
         .replace('src="./', f'crossorigin="anonymous" src="{asset_url}/')
     )
 
-    # Append to body
+    # Append to head
     html = html.replace("</head>", f"{static_block}</head>")
     # Append to body
     html = html.replace("</body>", f"{code_block}</body>")

diff --git a/marimo/_smoke_tests/theming/custom_css.py b/marimo/_smoke_tests/theming/custom_css.py
@@ -1,3 +1,10 @@
+# /// script
+# requires-python = ">=3.11"
+# dependencies = [
+#     "vega-datasets",
+#     "marimo",
+# ]
+# ///
 import marimo
 
 __generated_with = "0.8.3"

diff --git a/tests/_server/api/endpoints/test_assets.py b/tests/_server/api/endpoints/test_assets.py
@@ -1,7 +1,6 @@
 # Copyright 2024 Marimo. All rights reserved.
 from __future__ import annotations
 
-import os
 from tempfile import TemporaryDirectory
 from typing import TYPE_CHECKING, Any, cast
 
@@ -35,36 +34,6 @@ def test_index(client: TestClient) -> None:
     assert f"<title>{title}</title>" in content
 
 
-def test_custom_css_empty(client: TestClient) -> None:
-    response = client.get("/custom.css", headers=token_header())
-    assert response.status_code == 200, response.text
-    assert response.headers["content-type"] == "text/css; charset=utf-8"
-
-
-def test_custom_css_non_empty(client: TestClient) -> None:
-    session_manager = AppState.from_app(cast(Any, client.app)).session_manager
-    css = "/* custom css */"
-    filename = session_manager.file_router.get_unique_file_key()
-    assert filename is not None
-
-    css_file = os.path.join(os.path.dirname(filename), "custom.css")
-    with open(css_file, "w") as f:
-        f.write(css)
-
-    # set config
-    session_manager.app_manager(filename).save_app_config(
-        {"css_file": "custom.css"}
-    )
-
-    try:
-        response = client.get("/custom.css", headers=token_header())
-        assert response.status_code == 200, response.text
-        assert response.headers["content-type"] == "text/css; charset=utf-8"
-        assert response.text == css
-    finally:
-        os.remove(css_file)
-
-
 @with_file_router(AppFileRouter.from_files([]))
 def test_index_when_empty(client: TestClient) -> None:
     # Login page

diff --git a/tests/_server/templates/test_templates.py b/tests/_server/templates/test_templates.py
@@ -81,6 +81,29 @@ def test_notebook_page_template_edit_mode(self) -> None:
         assert self.filename in result
         assert "edit" in result
 
+    def test_notebook_page_template_custom_css(self) -> None:
+        # Create css file
+        css = "/* custom css */"
+
+        css_file = os.path.join(os.path.dirname(self.filename), "custom.css")
+        with open(css_file, "w") as f:
+            f.write(css)
+
+        try:
+            result = templates.notebook_page_template(
+                self.html,
+                self.base_url,
+                self.user_config,
+                self.server_token,
+                _AppConfig(css_file="custom.css"),
+                self.filename,
+                self.mode,
+            )
+
+            assert css in result
+        finally:
+            os.remove(css_file)
+
 
 class TestHomePageTemplate(unittest.TestCase):
     def setUp(self) -> None: