prevented select highlight & default context menus

src/app.css

@@ -77,6 +77,15 @@
   background-color: transparent;
 }
 
+* {
+  -webkit-touch-callout: none; /* iOS Safari */
+  -webkit-user-select: none; /* Safari */
+  -khtml-user-select: none; /* Konqueror HTML */
+  -moz-user-select: none; /* Firefox */
+  -ms-user-select: none; /* Internet Explorer/Edge */
+  user-select: none; /* Standard property */
+}
+
 .pixelated {
   image-rendering: pixelated;
 }

src/routes/+layout.svelte

@@ -51,6 +51,10 @@
       stopUserStatus();
       stopAppState();
     });
+
+    document.addEventListener("contextmenu", (e) => {
+      e.preventDefault();
+    });
   }
 </script>