Bug 1800421: Needing to use older SASS variables in backport

otherwise 'make css' fails

behatnotneeded

Change-Id: I47e6fda1999e95adc561c6bdeeda5fe8246c765e
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>

htdocs/theme/raw/sass/_custom.scss

@@ -634,10 +634,10 @@ div.toolbarhtml {
     }
 }
 .viewinstruction-export {
-    border: 1px solid $card-border-color;
+    border: 1px solid #d9d9d9 !important;
     padding: 10px 15px;
     margin-bottom: -1px; //remove double border
-    background-color: $gray-100 !important;
+    background-color: $gray-lighter !important;
 }
 .releaseviewform {
     position: relative;