Change font color "forgot password" + add option "stay logged in"

I’d like to change the color of the text “Forgot password” on the loginscreen from black to white.
I’ve tried the solution proposed in this topic but I’ve noticed the color in my guest.css is already set to white.

/* Dark subtle label text */,
form fieldset legend,
#datadirContent label,
form fieldset .warning-info,
form input[type=‘checkbox’]+label {
text-align: center;
color: #fff;

Could it be this has moved to another section (I’m running NC16)?

Also, in older versions of Nextcloud there was an thickmark “stay logged in” at the login screen.
Is there a possibility to re-add this?

Kind regards,