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Remove background image in editor
Locate folder/files : WP-ADMIN / POST.PHP and POST_NEW.PHP .
Add this script to the end of the pages.
?>
<style>
.edit-post-layout__content,
.edit-post-visual-editor.editor-styles-wrapper {
background-image: none;
background-color: #ffffff;
}
.editor-styles-wrapper {
color: #000000 !important;
}
</style>