Add custom CSS in admin panel.

add_css_adminpanels.php

<?php

function dkc_add_css_on_pages() {
    echo '
            #csp-dialog-msgid[style], #csp-dialog-msgid-plural[style] {font-size:14px!important; font-family:"Lucida Console"!important; color:#333; padding:10px;background:#D8E8F5;border:none;line-height:18px!important  }
 
            #csp-dialog-msgstr[style], #csp-dialog-msgstr-0[style], #csp-dialog-msgstr-1[style] {font-size:14px!important; font-family:"Lucida Console"!important; color:#000; background:#FAFCFE;border:none;padding:10px;line-height:18px!important }
            #csp-dialog-msgstr[style]:focus, #csp-dialog-msgstr-0[style]:focus, #csp-dialog-msgstr-1[style]:focus {font-size:14px!important;-webkit-box-shadow:  0px 1px 0px 2px #A6BFD3; box-shadow:  0px 1px 0px 2px #A6BFD3;:  0px 0px 10px 2px #A6BFD3;background:#f7f7f7}
 
            #csp-dialog-body strong {color:#85B7E0}
          ';
}
add_action('admin_head', 'dkc_add_css_on_pages');