diff --git a/.gitignore b/.gitignore
index 4ba733f2..01faf2b6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,6 @@ passerelle.egg-info/
 .coverage
 coverage.xml
 junit-py*.xml
+.sass-cache/
+passerelle/static/css/style.css
+passerelle/static/css/style.css.map
diff --git a/debian/control b/debian/control
index 9a30c88e..222ad2dc 100644
--- a/debian/control
+++ b/debian/control
@@ -6,6 +6,7 @@ Build-Depends: debhelper-compat (= 12),
     python3-django,
     python3-setuptools,
     python3-all,
+    sassc,
     dh-python
 Standards-Version: 3.9.6
 Homepage: https://dev.entrouvert.org/projects/passerelle
diff --git a/passerelle/static/css/style.css b/passerelle/static/css/style.scss
similarity index 100%
rename from passerelle/static/css/style.css
rename to passerelle/static/css/style.scss
diff --git a/setup.py b/setup.py
index bb614f6e..63c7cd80 100755
--- a/setup.py
+++ b/setup.py
@@ -5,6 +5,8 @@ import subprocess
 import sys
 from distutils.cmd import Command
 from distutils.command.build import build as _build
+from distutils.errors import CompileError
+from distutils.spawn import find_executable
 
 from setuptools import find_packages, setup
 from setuptools.command.install_lib import install_lib as _install_lib
@@ -77,8 +79,44 @@ class compile_translations(Command):
             os.chdir(curdir)
 
 
+class compile_scss(Command):
+    description = 'compile scss files into css files'
+    user_options = []
+
+    def initialize_options(self):
+        pass
+
+    def finalize_options(self):
+        pass
+
+    def run(self):
+        sass_bin = None
+        for program in ('sassc', 'sass'):
+            sass_bin = find_executable(program)
+            if sass_bin:
+                break
+        if not sass_bin:
+            raise CompileError(
+                'A sass compiler is required but none was found.  See sass-lang.com for choices.'
+            )
+
+        for path, dirnames, filenames in os.walk('passerelle'):
+            for filename in filenames:
+                if not filename.endswith('.scss'):
+                    continue
+                if filename.startswith('_'):
+                    continue
+                subprocess.check_call(
+                    [
+                        sass_bin,
+                        '%s/%s' % (path, filename),
+                        '%s/%s' % (path, filename.replace('.scss', '.css')),
+                    ]
+                )
+
+
 class build(_build):
-    sub_commands = [('compile_translations', None)] + _build.sub_commands
+    sub_commands = [('compile_translations', None), ('compile_scss', None)] + _build.sub_commands
 
 
 class install_lib(_install_lib):
@@ -128,6 +166,7 @@ setup(
     ],
     cmdclass={
         'build': build,
+        'compile_scss': compile_scss,
         'compile_translations': compile_translations,
         'install_lib': install_lib,
         'sdist': eo_sdist,