Add option for custom CSS (#652)

* Add option for adding custom CSS

* add missing migration

bookmarks/tests/test_custom_css.py

@@ -0,0 +1,21 @@
+from django.test import TestCase
+from django.urls import reverse
+
+from bookmarks.tests.helpers import BookmarkFactoryMixin
+
+
+class CustomCssTestCase(TestCase, BookmarkFactoryMixin):
+    def setUp(self):
+        self.client.force_login(self.get_or_create_test_user())
+
+    def test_does_not_render_custom_style_tag_by_default(self):
+        response = self.client.get(reverse("bookmarks:index"))
+        self.assertNotContains(response, "<style>")
+
+    def test_renders_custom_style_tag_if_user_has_custom_css(self):
+        profile = self.get_or_create_test_user().profile
+        profile.custom_css = "body { background-color: red; }"
+        profile.save()
+
+        response = self.client.get(reverse("bookmarks:index"))
+        self.assertContains(response, "<style>body { background-color: red; }</style>")