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I am trying to create a custom theme for admin panel in magento 2.3.0. Below are the steps which i have followed:

1) Created a folder structure in 

app/design/adminhtml/Vendor name/theme name

2) Added theme.xml and added below code:

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

3) Added registration.php and added below code:

use \Magento\Framework\Component\ComponentRegistrar;

ComponentRegistrar::register(ComponentRegistrar::THEME, 'adminhtml/vendor name/theme name', __DIR__);

4) Added a module to change admin panel login logo:

added Magento_Backend folder

added layout folder

added admin_login.xml and below code into it

   <page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" layout="admin-login" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
    <body>
        <referenceBlock name="logo">
            <arguments>
                <argument name="logo_image_src" xsi:type="string">images/Logo_Icon_Black.svg</argument>
            </arguments>
        </referenceBlock>
    </body>
 </page>

5) after creating above folders trying to run below commands

php bin/magento setup:upgrade
php bin/magento setup:di:compile
php bin/magento setup:static-content:deploy -f

Still my changes are not getting relfected. Any help would be appreciated

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After create a theme, you have to Create a Module to Declare Theme.

Step 1: Create the registration.php file

app/code/Vendor/Backend/registration.php

<?php
    \Magento\Framework\Component\ComponentRegistrar::register(
    \Magento\Framework\Component\ComponentRegistrar::MODULE,    
    'Vendor_Backend',__DIR__);
?>

app/code/Vendor/Backend/etc/module.xml

<?xml version="1.0"?><config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
    <module name="Vendor_Backend" setup_version="0.0.1">
        <sequence><module name="Magento_Theme"/></sequence>
    </module>
</config>

app/code/Vendor/Backend/etc/di.xml

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="Magento\Theme\Model\View\Design">       
        <arguments>
            <argument name="themes" xsi:type="array">
                <item name="adminhtml" xsi:type="string">Vendor/ThemeName</item>
            </argument>
        </arguments>
    </type>
</config>

And then run commands.

php bin/magento setup:upgrade
php bin/magento setup:di:compile
php bin/magento setup:static-content:deploy -f

You can refer this URLs,

Create a theme:

 https://devdocs.magento.com/guides/v2.3/frontend-dev-guide/themes/admin_theme_create.html

Apply theme:

 https://devdocs.magento.com/guides/v2.3/frontend-dev-guide/themes/admin_theme_apply.html
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