How do I edit the wordpress install.css with a function or plug? [closed]

Question

I thought before wordpress ms would redirect you automatically to that sites dashboard. but now it lists the sites you own and shows an error message.(if you attempt to log into the main site) I guess I am ok with it but want to hide the error message. I could do this by editing the install.css with:

#error-page p {display: none !important;}

I dont want to edit the core files. I'd like to do it with a function.

Answer 1

You can do this using the login_head function. Adding the following to your themes functions.php file or wrapping it up in a plugin should do what your after:

<?php add_action("login_head", "my_login_head");
function my_login_head() {
    echo "
        <style>
            #error-page p {display: none !important;}
        </style>
    ";
} ?>