diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index 8607a8e5..b7d9e456 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -4,6 +4,7 @@ on:
   push:
     branches:
       - develop
+      - feat/custom
   release:
     types: [published]
 
diff --git a/.gitignore b/.gitignore
index 31d2e625..b9f47a69 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,6 +23,7 @@ atlas/static/custom/territoire.json
 atlas/static/custom/glossaire.json
 atlas/static/custom/custom.css
 atlas/static/custom/maps-custom.js
+atlas/static/custom/images/picto*.png
 
 static/custom/territoire.json
 static/custom/glossaire.json
diff --git a/atlas/app.py b/atlas/app.py
index 69c3f8a2..8675d248 100644
--- a/atlas/app.py
+++ b/atlas/app.py
@@ -5,6 +5,9 @@
 from flask_sqlalchemy import SQLAlchemy
 from flask_babel import Babel, format_date, gettext, ngettext, get_locale
 from werkzeug.middleware.proxy_fix import ProxyFix
+from werkzeug.middleware.shared_data import SharedDataMiddleware
+from werkzeug.middleware.dispatcher import DispatcherMiddleware
+from werkzeug.wrappers import Response
 
 from atlas.configuration.config_parser import valid_config_from_dict
 from atlas.configuration.config_schema import AtlasConfig, SecretSchemaConf
@@ -34,9 +37,7 @@ def create_app():
 
     app.config.from_prefixed_env(prefix="ATLAS")
     config_valid = valid_config_from_dict(copy.copy(app.config), AtlasConfig)
-    config_secret_valid = valid_config_from_dict(
-        copy.copy(app.config), SecretSchemaConf
-    )
+    config_secret_valid = valid_config_from_dict(copy.copy(app.config), SecretSchemaConf)
 
     app.config.update(config_valid)
     app.config.update(config_secret_valid)
@@ -59,9 +60,7 @@ def get_locale():
         from atlas.atlasRoutes import main as main_blueprint
 
         if app.config["MULTILINGUAL"]:
-            app.register_blueprint(
-                main_blueprint, url_prefix="/<lang_code>", name="multi_lg"
-            )
+            app.register_blueprint(main_blueprint, url_prefix="/<lang_code>", name="multi_lg")
         app.register_blueprint(main_blueprint)
 
         from atlas.atlasAPI import api
@@ -72,6 +71,19 @@ def get_locale():
             os.environ["SCRIPT_NAME"] = app.config["APPLICATION_ROOT"].rstrip("/")
         app.wsgi_app = ProxyFix(app.wsgi_app, x_host=1)
 
+        app.wsgi_app = SharedDataMiddleware(
+            app.wsgi_app,
+            {
+                app.static_url_path: f"{atlas_static_folder}/custom",
+            },
+        )
+
+        if app.config["APPLICATION_ROOT"] != "/":
+            app.wsgi_app = DispatcherMiddleware(
+                Response("Not Found", status=404),
+                {app.config["APPLICATION_ROOT"].rstrip("/"): app.wsgi_app},
+            )
+
         @app.context_processor
         def inject_config():
             configuration = copy.copy(app.config)
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 00000000..fdf7478a
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,21 @@
+[tool.black]
+line-length = 99
+exclude ='''
+(
+  /(
+      \.eggs         # exclude a few common directories in the
+    | \.git          # root of the project
+    | \.hg
+    | \.mypy_cache
+    | \.tox
+    | \.venv
+    | _build
+    | buck-out
+    | build
+    | dist
+    | node_modules
+    | venv
+    | dependencies
+  )/
+)
+'''