[CORD-2810] Prevent the user from inserting values in read_only fields

Change-Id: I00460544dd7d36f8482b04ea89912005a108f6b8
diff --git a/src/app/core/field/field.scss b/src/app/core/field/field.scss
index 7bdb659..b86c95f 100644
--- a/src/app/core/field/field.scss
+++ b/src/app/core/field/field.scss
@@ -18,6 +18,12 @@
 
 @import "../../style/vars";
 
-span.required {
+span.required,
+span.read-only {
   color: $color-accent;
+}
+
+span.read-only {
+  vertical-align: super;
+  font-size: 70%;
 }
\ No newline at end of file