WordPress TinyMCE Custom Style Enquing & CSS

In functions.php:

add_action( 'after_setup_theme', 'custom_editor_setup' );
function custom_editor_setup()
{
    add_editor_style( 'custom-editor-style.css' );
}





In custom-editor-style.css:

html .mceContentBody {
        font-size: 100%;
        background-color: #0F0 !important;
}

body {
        color: #0F0;
        font-family: "Noto Serif", serif;
        font-weight: 400;
        font-size: 17px;
        line-height: 1.6471;
        margin: 20px 40px;
        max-width: 660px;
        vertical-align: baseline;

        background: #F00 !important;
}