Owlpixel

This plugin comes with a lot of feature specially for login page of wordpress. 
Custom background for login page, Custom background for login form, Change all the color of login page. All of this can be done with this plugin. 
Admin login page customization never being easy without this plugin. 
You can change admin page background, login page background, custom logo etc. 
You can see your login page by adding slug “wp-login” or “wp-admin” after your domain…
All can be done with this –>
<pre><code>* Upload custom logo to admin page
* Customize background image of admin page area
* Customize background image of admin login form area
* Change background color of login page
* Change background color of login form
* Change color of label for fields
* Change color of nav link bottom of form
* Change the color of submit button
* Change the color of submit button text
* Add custom css
* More are coming soon...
</code></pre>
<h3>Video Tutorial</h3>
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/Ri_d1OmnbfU?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>

Custom login page

Custom login page Customizer, Add custom logo,Custom background and more.

Harish Chouhan

Themeist Co

Custom Login Logo lets you replace the default WordPress login logo with your own — no need to touch code or upload files via FTP.
Just activate the plugin and use the built-in media uploader on the settings page to upload your custom login logo. It’s quick, simple, and works with most themes.
This plugin is perfect for branding client sites, personalising the login screen, or maintaining a consistent visual identity.
Features: 
– Upload your custom logo using the built-in WordPress media uploader 
– No need for FTP or coding 
– Works with most themes and setups 
– Retina/high-DPI image compatible 
– Lightweight and fast
If you find this plugin useful, please consider leaving a 5-star review on WordPress.org.

Custom Login Logo – Easily Add a Logo to Your WordPress Login Page

Easily add a custom logo to your WordPress login page using the built-in media uploader.

Custom login page vs Custom Login Logo – Easily Add a Logo to Your WordPress Login Page