diff --git a/css/common-files/color_variables.css b/css/common-files/color_variables.css
index ef99085..a002185 100644
--- a/css/common-files/color_variables.css
+++ b/css/common-files/color_variables.css
@@ -18,6 +18,7 @@ url(https://www.mozilla.org/credits/),
 url-prefix(https://addons.mozilla.org),
 url-prefix(http://addons.mozilla.org),
 url-prefix(moz-extension),
+url-prefix(view-source),
 regexp(".*\\.(p|P)(d|D)(f|F).*") {
   :root {
     --magenta-50: #ff1ad9;
@@ -150,4 +151,4 @@ regexp(".*\\.(p|P)(d|D)(f|F).*") {
     --end-indicator-for-updater-scripts: black;
     --dummy-variable-for-updater-scripys: black
   }
-}
\ No newline at end of file
+}
diff --git a/css/userContent-files/pdf.css b/css/userContent-files/pdf.css
index 3766065..e05366a 100644
--- a/css/userContent-files/pdf.css
+++ b/css/userContent-files/pdf.css
@@ -30,7 +30,8 @@
   }
   #pageNumber,
   #scaleSelectContainer {
-    border: 1px solid!important
+      border: 1px solid!important;
+    border-color: var(--in-content-box-border-color) !important;
   }
   #loadingBar {
     position: relative;
@@ -98,4 +99,4 @@
     background-color: var(--in-content-box-border-color)!important;
     box-shadow: none!important
   }
-}
\ No newline at end of file
+}