Add clearer indication of interval patreon requirements

web/static/css/style.css

@@ -719,9 +719,20 @@ a.switch-pane {
 
 .is-locked {
     pointer-events: none;
+}
+
+.is-locked > :not(.patreon-invert) {
     opacity: 0.4;
 }
 
+.is-locked .patreon-invert {
+    display: block;
+}
+
+.patreon-invert {
+    display: none;
+}
+
 .is-locked .foreground {
     pointer-events: auto;
 }