disable call highlight on buttons

packages/excalidraw/css/styles.scss

@@ -44,6 +44,11 @@ body.excalidraw-cursor-resize * {
   height: 100%;
   width: 100%;
 
+  button,
+  label {
+    @include buttonNoHighlight;
+  }
+
   button {
     cursor: pointer;
     user-select: none;

packages/excalidraw/css/variables.module.scss

@@ -129,6 +129,12 @@
   }
 }
 
+@mixin buttonNoHighlight {
+  -webkit-tap-highlight-color: transparent;
+  -webkit-touch-callout: none;
+  user-select: none;
+}
+
 @mixin outlineButtonIconStyles {
   @include outlineButtonStyles;
   padding: 0;