Improve compatability with pocket bird extension

public/css/index.css

@@ -666,5 +666,5 @@ h2 + .header-anchor {
 	grid-template-columns: repeat(var(--grid-columns), 1fr);
 }
 .hidden {
-	display: none;
+	display: none !important;
 }

public/css/woo-mode.css

@@ -1,7 +1,7 @@
 body {
 	background: none;
 }
-canvas {
+canvas#shaderCanvas {
 	display: block;
 	opacity: 0.35;
 	pointer-events: none;