Add Global Colours to WP Editor

snippet.php

// Adds brand colours to editor palette for content editors
add_theme_support( 'editor-color-palette', array(
	array(
		'name'  => 'Primary',
		'slug'  => 'primary',
		'color'	=> '#db164d', // Replace with your colour
	),
	array(
		'name'  => 'Secondary',
		'slug'  => 'secondary',
		'color' => '#111', // Replace with your colour
	),
	array(
		'name'  => 'Link Hover',
		'slug'  => 'link-hover',
		'color' => '#c20034', // Replace with your colour
       ),
) );

// Disables access to all other colors
add_theme_support( 'disable-custom-colors' );