Site Icon Background Color – Gutenberg Fullscreen Mode

Hello

Is there a way to change the background color of the Site Logo while in Full Screen mode without using CSS?

By default it brings in the Favicon and places it above a black background?
This is not a good user experience and fails accessibility if the Favicon is also black.

Below is the CSS code I have to add if I want to remove the default black background of the Site Icon.

.edit-post-fullscreen-mode-close.has-icon{background-color:#fff!important;border-bottom:1px solid #e0e0e0}
.edit-post-fullscreen-mode-close.components-button:before{box-shadow:none;}