Dojo Digital

This plugin adds a textarea to the Customize page that allows theme editors to write, preview, and implement CSS code in real time. 
It also includes a frontend CSS editor window with live preview capability.

Live CSS Preview

Live front-end and Customizer CSS editing powered by native WordPress Additional CSS storage.

AYESHA

Discretelogix

TAHIR

WP Admin Formatter – Customize Admin Panel provides multiple features to Customize Admin Panel that you don’t have in wordpress by default. General Tab is for customizing Login Page mostly and Advanced tab is for customizing Admin Panel colors.
Features in WP Admin Formatter – Customize Admin Panel include:
<ul>
<li>Change Login page logo</li>
<li>Set Login Page Background Color</li>
<li>Set Login Page Background Image</li>
<li>Change Login Page Form Background Color</li>
<li>Change Login Page Form Field Background Color</li>
<li>Change Login Page Form Text Color</li>
<li>Increase Upload Media File Size</li>
<li>Set Website Favicon Image</li>
<li>Change Welcome Message</li>
<li>Change Footer Text</li>
<li>Hide WordPress Logo on Dashboard</li>
<li>Hide Admin Bar on Front End</li>
<li>Change Navigation Background Color</li>
<li>Change Navigation Font Color</li>
<li>Change Navigation Font Hover Color</li>
<li>Change Navigation Hover Background Color</li>
<li>Change Sub Navigation Background Color</li>
<li>Change Sub Navigation Font Color</li>
<li>Change Icons Color</li>
<li>
Reset All Changes
</li>
<li>
Login page logo, so you can easily upload the login logo image and press save changes button.
</li>
<li>Login Page Background Color, so you can easily select Login Page Background Color from the picker and press save changes button. </li>
<li>Login Page Background Image, so you can easily upload the login page Background image and press save changes button.</li>
<li>Login Page Form Background Color, so you can easily select Login Page Form Background Color from the picker and press save changes button.</li>
<li>Login Page Form Field Background Color, so you can easily select Login Page Form Field Background Color from the picker and press save changes button.</li>
<li>Login Page Form Text Color, so you can easily select Login Page Form Text Color from the picker and press save changes button.</li>
<li>Upload Media File Size, so you can easily Increase Upload Media File Size up to 300MB by mentioning the number in MB in the numbered list</li>
<li>Website Favicon Image, so you can easily upload a Website Favicon Image and press save changes button. </li>
<li>Welcome Message, so you can easily change the welcome message that you want instead of Howdy.</li>
<li>Footer Text, so you can easily change default Footer text by writing in the text field labeled Footer Text and press save changes button. </li>
<li>WordPress Logo, so you can easily hide wordpress logo by checking the mentioned checkbox. </li>
<li>Admin Bar, so you can easily hide Admin Bar while you are logged in, by checking the mentioned checkbox. </li>
<li>Navigation Background Color, so you can easily select Navigation Background Color from the picker and press save changes button.</li>
<li>Navigation Font Color, so you can easily select Navigation Font Color from the picker and press save changes button.</li>
<li>Navigation Font Hover Color, so you can easily select Navigation Font Hover Color from the picker and press save changes button.</li>
<li>Navigation Hover Background Color, so you can easily select Navigation Hover Background Color from the picker and press save changes button.</li>
<li>Sub Navigation Background Color, so you can easily select Sub Navigation Background Color from the picker and press save changes button.</li>
<li>Sub Navigation Font Color, so you can easily select Sub Navigation Font Color from the picker and press save changes button.</li>
<li>Icons Color, so you can easily select Icons Color from the picker and press save changes button.</li>
<li>Reset Changes, so you can easily reset all Changes by pressing Reset Changes button.</li>
</ul>

WP Admin Formatter – Customize Admin Panel

WP Admin Formatter - Customize Admin Panel provides multiple features to Customize Admin Panel that you don't have in wordpress by default.

Live CSS Preview vs WP Admin Formatter – Customize Admin Panel