MyBB Community Forums

1. how do i change the box color of when someone is banned (if it's possible)

It currenty looks likes 

I wanna change the background and text color of that

2. When a user has no permission to view something or is banned they see this message 

Forums
You are currently logged in with the username: 'username'

How can i change this message (By the way I'm sorry for the two question in one thread)

Welcome to MyBB

1]
template name : global_bannedwarning
you can change class="red_alert" with class="ban_alert" and
add required style properties for .ban_alert in global.css of the theme

[MyBB Templates System]

note: edit the stylesheet in forum admin panel (through themes section) AND in advanced edit mode (tab)

2]
template name : error_nopermission_loggedin

{$lang->error_nopermission_user_5}

above code can be replaced with required text