No Custom CSS/JS box?

Hey there, first, nice plugin. Thanks for sharing your work!

Is there not a Custom CSS/JS box for us to insert CSS to edit certain elements of this form? Screenshot: https://prnt.sc/qARwvxRjKUwb

For example, I might want to adjust the opacity of the form’s background or add a border with certain color, etc.

Kinda like this example below. I added it under Appearance / Customizer / Additional CSS but that didn’t work. Perhaps this plugin requires its dedicated Additional CSS box? Let me know. Thanks!

#login form {
background-color: rgb(79, 40, 24, .7);
border: 1px solid rgba(249, 201, 102, 0.4);
}