<?php
function adminStylesCss() {
echo '
<style>

/* Admin BG color */
.wp-admin {
  background-color: #262626;
}

/* Revert colors and bring back links colors */
.wp-admin #wpbody {
  filter: invert(0.85) hue-rotate(185deg);
}

/* Bring back colors to the images */
.wp-admin #wpbody img {
  filter: invert(0.85) hue-rotate(-185deg);
  background: white;
}

/* Gutenberg bring it back */
.block-editor-page #wpbody {
  filter: unset;
}
/* Gutenberg topbar */
.block-editor-page .interface-interface-skeleton__header {
  filter: invert(0.85) hue-rotate(185deg);
}
.block-editor-page .is-primary {
  color: black !important;
}

/* Gutenberg sidebars */
.block-editor-page .interface-interface-skeleton__sidebar,
.block-editor-page .interface-interface-skeleton__secondary-sidebar {
  filter: invert(0.85) hue-rotate(185deg);
}

/* Gutenberg Content - Manual colors */
.block-editor-page .editor-styles-wrapper {
  color: lightgray;
  background: #262626;
}

/* Gutenberg Links */
.block-editor-page .editor-styles-wrapper a {
  filter: invert(0.85) hue-rotate(185deg);
}

/* Gutenberg Metaboxes - Bellow content */
.block-editor-page .edit-post-layout__metaboxes {
  border-top: 0px;
  background-color: #262626;
}

</style>';

}
add_action('admin_head', 'adminStylesCss');

?>