Better feedback on button clicks

main.go

@@ -558,7 +558,7 @@ func (rm *room) sendAdminEvent(ae *adminEvent) {
 }
 
 func (rm *room) sendControlEvent(ce *controlEvent) {
-	for present, _ := range rm.present {
+	for present := range rm.present {
 		present <- ce
 	}
 }

static/remote.css

@@ -70,8 +70,8 @@ tfoot tr {
   user-select: none;
 }
 
-.control-button:active {
-  background: var(--subtle-color);
+.controls.enable .control-button:active {
+  background: var(--highlight-color);
   transition: none;
 }