<?php
$wp_customize->add_section('about', array(

      'title' => __('Section : About','bordered'),
      'priority' => 3,
      'panel' => 'panel_bordered'

));

// Skill Section Title

$wp_customize->add_setting('about_title', array(
  'sanitize_callback'  => 'esc_attr',
  'default' => __('About Me','bordered'),
  'transport' => 'refresh'
));
$wp_customize->add_control('about_title', array(
'section' => 'about',
'label' => __('About Title','bordered'),
'type' => 'text',
'priority' => 1
));

$wp_customize->add_setting('about_text', array(
  'sanitize_callback'  => 'esc_attr',
  'default' => __('Who are u','bordered'),
  'transport' => 'refresh'
));
$wp_customize->add_control('about_text', array(
'section' => 'about',
'label' => __('About Text','bordered'),
'type' => 'textarea',
'priority' => 2
));

$wp_customize->selective_refresh->add_partial( 'about_title', array(
  'selector' => '#about', // You can also select a css class
) );


?>