fix: compatibility with gutenberg

Author: girishpanchal30

assets/scss/gutenberg-editor-style.scss

@@ -5,10 +5,9 @@
   -webkit-font-smoothing: antialiased;
   -moz-osx-font-smoothing: grayscale;
 
-  &, > * {
+  &, > *:not(.block-canvas-cover) {
 	background-color: var(--nv-site-bg);
 	color: var(--nv-text-color);
-  z-index: 99999;
   }
 
   .wp-block {