Magento2 : Create a custom backend theme

Hello Friends,

     Here is the code for create a custom theme for the backend in magento 2 !
   
     Magento2 provide Backend as a admin theme !

     Magento 2.X is a quite different process as compare of Magento 1.X, there are few easy steps for it !

Step 1 : Create a theme directory at below location,

app\design\adminhtml\Magento\custom

Step 2 : Now, Create 3 files inside custom directory,

A) composer (This is JSON file)

B) registration (This is PHP file)

C) theme (This is XML file)

Now, Copy/Paste below code in side related files,

Step A : composer (This is JSON file)
             
                {
                    "name": "magento/theme-adminhtml-custom",
                    "description": "N/A",
                    "require": {
                        "php": "~5.6.0|7.0.2|~7.0.6",
                        "magento/theme-adminhtml-backend": "~100.0",
                        "magento/framework": "~100.0"
                    },
                    "type": "magento2-theme",
                    "version": "1.0.0",
                    "license": [
                        "OSL-3.0",
                        "AFL-3.0"
                    ],
                    "autoload": {
                        "files": [
                            "registration.php"
                        ]
                    }
                }

   Step B : registration (This is PHP file)

<?php
                /**
                 * Copyright © 2016 Magento. All rights reserved.
                 * See COPYING.txt for license details.
                 */
             
                \Magento\Framework\Component\ComponentRegistrar::register(
                    \Magento\Framework\Component\ComponentRegistrar::THEME,
                    'adminhtml/Magento/custom',
                    __DIR__
                );

   Step C : theme (This is XML file)

                <theme xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Config/etc/theme.xsd">
                    <title>Magento 2 new backend</title>
                    <parent>Magento/backend</parent>
                </theme>


Step 6 : Now, just run upgrade & deploy commands

       A) php bin/magento setup:upgrade

       B) php bin/magento setup:static-content:deploy
 
       you can see you custom theme name as Magento/custom while deploying !