John Mann

This is used to change the header image, background color, and header link on the login page. 
Simple customization for the login page to make it more personalized.
<ol>
<li>Customize login header image</li>
<li>Customize link for that image.</li>
<li>Customize background color</li>
<li>Customize link colors and hover colors on login page.</li>
</ol>
Features: Uses new Color Picker, is localizable, uses media picker for images.

LotekMedia Custom Login

This is a plug-in to do some basic customization to the login page.

binarymoon

Bartosz Gadomski

Teydea Studio

WP Custom Login lets you fully customize the WordPress login page to match your brand identity.
Whether you run a single site or a multisite network, this plugin gives you control over every visual element of the login screen — from the logo and background to form fields, buttons, links, and more.
Key benefits:
<ul>
<li>Adjust colors, fonts, spacing, and layout of every login page element without writing CSS.</li>
<li>Add your logo, social media links, and custom footer to create a branded login experience.</li>
<li>Support for multilingual sites with per-language text customization for labels, buttons, and notices.</li>
<li>Works with WordPress multisite networks for consistent branding across all sites.</li>
</ul>
WP Custom Login is a good fit for freelancers, agencies, and organizations that want a professional, branded login page. It includes a live preview in the admin settings, so you can see your changes before they go live.
Learn more at <a href="https://wpcustomlogin.com/?utm_source=WP+Custom+Login" rel="nofollow ugc">wpcustomlogin.com</a>.
<h3>Features</h3>
<h4>Free Features</h4>
<ul>
<li>Body background color — Set a custom background color for the login page.</li>
<li>Custom logo — Replace the WordPress logo with your site icon or a custom image, and configure its link URL and alignment.</li>
<li>Form container styling — Customize the form background color, border radius, padding, box shadow, and alignment.</li>
<li>Label styling — Adjust font size, weight, letter case, spacing, text color, and toggle label visibility.</li>
<li>Input field styling — Set background colors, borders, padding, font, shadow, and placeholder text for normal, hover, and focus states.</li>
<li>Checkbox styling — Apply custom colors to the login form checkboxes and checkmark icon.</li>
<li>Primary button styling — Customize colors, font, size, width, alignment, shadow, and per-language button labels.</li>
<li>Secondary button styling — Configure colors, font, border, and per-language labels for secondary buttons.</li>
<li>Notice and error styling — Set colors for error, notice, and success messages, and add a custom persistent notice with per-language text.</li>
<li>Under-form links — Customize link colors, separator, disable the “Back to” link, or add custom links.</li>
<li>Social media icons — Display up to 23 social media icon links (Facebook, X, Instagram, LinkedIn, YouTube, GitHub, and more), placed before the form, after the form, or in the footer.</li>
<li>Privacy policy link — Show or hide the privacy policy link and set its color.</li>
<li>Language switcher — Show or hide the WordPress language switcher and adjust its icon color and spacing.</li>
<li>Custom footer — Add a footer with configurable text, font, color, and alignment.</li>
<li>Custom CSS — Add your own CSS for additional styling.</li>
<li>Live preview — See your changes in real time within the admin settings page.</li>
<li>Disable autofocus — Turn off the default autofocus behavior on the login form.</li>
<li>Disable error shake — Turn off the shake animation on failed login attempts.</li>
<li>Disable autocomplete — Prevent browsers from auto-filling the login form.</li>
<li>Per-language text — Customize labels, placeholders, button text, and notices for each language on multilingual sites.</li>
<li>“Remember Me” customization — Show or hide the “Remember Me” checkbox and set custom label text per language.</li>
</ul>
<h4>PRO Features</h4>
<ul>
<li><a href="https://wpcustomlogin.com/?utm_source=WP+Custom+Login" rel="nofollow ugc">Pre-designed templates</a> — Choose from 20+ ready-made login page designs and apply them with one click.</li>
<li><a href="https://wpcustomlogin.com/?utm_source=WP+Custom+Login" rel="nofollow ugc">Advanced backgrounds</a> — Use animated gradients, image slideshows, or split-screen layouts as your login page background.</li>
<li><a href="https://wpcustomlogin.com/?utm_source=WP+Custom+Login" rel="nofollow ugc">Post-login redirects</a> — Redirect users to specific pages after login based on their roles.</li>
<li><a href="https://wpcustomlogin.com/?utm_source=WP+Custom+Login" rel="nofollow ugc">Premium support</a> — Get direct support from the development team.</li>
</ul>

WP Custom Login

Not too much, not to little, just right.  Allows for custom logo, font and button, and a little extra CSS if needed.  Based on the size of your logo you will need to adjust the background position and/or margins of the #login but with a few tweaks it looks great.  

goldilocks

Customize the WordPress login screen with your own colors, logo, backgrounds, and form styles.

LotekMedia Custom Login vs WP Custom Login