Theme customizer not working

The simplest way to use this feature:

  1. Add add_theme_support( 'custom-background' ); to functions.php
  2. Use body_class() in your body tag like this: <body <?php body_class(); ?>>
  3. use <?php wp_head(); ?> in your head tag

if you go to the customizer should look like this:

enter image description here

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