several user QoL styling improvements, incl. footer icon .active color painting

src/functional_tests/base.py

@@ -37,9 +37,12 @@ class FunctionalTest(StaticLiveServerTestCase):
     # Helper methods
     def setUp(self):
         options = webdriver.FirefoxOptions()
-        if os.environ.get("HEADLESS"):
+        headless = os.environ.get("HEADLESS")
+        if headless:
             options.add_argument("--headless")
         self.browser = webdriver.Firefox(options=options)
+        if headless:
+            self.browser.set_window_size(1366, 900)
         self.test_server = os.environ.get("TEST_SERVER")
         if self.test_server:
             self.live_server_url = 'http://' + self.test_server