Update SCSS to module system (fixes #266)

Change-Id: I2387ef49dadaeac0f62620e0c803df12dad42cf8
diff --git a/dev/scss/base/banner.scss b/dev/scss/base/banner.scss
index 811cafe..3607002 100644
--- a/dev/scss/base/banner.scss
+++ b/dev/scss/base/banner.scss
@@ -1,3 +1,5 @@
+@use "colors";
+
 .banner {
   position: fixed;
   width: 10em;
@@ -32,8 +34,8 @@
     transform-origin: 0 0 ;
     transform:rotate(45deg);
 
-    background-color: $light-orange;
-    color: $dark-orange;
-    border: 1px solid $dark-orange;
+    background-color: colors.$light-orange;
+    color: colors.$dark-orange;
+    border: 1px solid colors.$dark-orange;
   }
 }
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