Fix black embedded links displays on Tooltips.

system/styles/scss/ui.scss

@@ -411,18 +411,25 @@ button {
             top: -1px;
             left: -1px;
         }
+
         .goodvalue {
             color: #4e8c69;
         }
+
         .badvalue {
             color: #ab2a00;
         }
+
         .reference {
             display: flex;
             .page {
                 margin-left: 1ch
             }
         }
+
+        .content-link {
+            background: initial;
+        }
     }
 }