Element color background in repeater with ACF

Create ACF field group and assign it to posts.

Create field label and name it color and choose field type Color picker.

Assign color to each post

Create a repeater in Oxygen builder

Select first child of Repeater

Add class to that element “data-color-bg”
Go to advanced > attributes > Add attribute. First field needs to be “data-color” and second one use data > Advanced Custom Field > Color

Add code block bellow repeater or for better experience use Scripts Organizer.

Paste JavaScript into JavaScript Tab

Final result

JavaScript Tab

(function($){

    $(function() {

		$(".data-color-bg").css('background', function () {
			return $(this).data('color')
		});

		
    });

})(jQuery);