<?php
class eStore_Custom_CSS_Control extends WP_Customize_Control {
   public $type = 'custom_css';

      public function render_content() {
      ?>
      <label>
         <span class="customize-control-title"><?php echo esc_html( $this->label ); ?></span>
         <textarea rows="5" style="width:100%;" <?php $this->link(); ?>><?php echo esc_textarea( $this->value() ); ?></textarea>
      </label>
      <?php
   }
}
