I saw a few that some members of few forums on forumpolish server have a shadow in the text in chatbox... How to make it? It looks so cool...

what you mean? like a text shadow over a user's name? or the messages sent into the chatbox?

Messages into the chatbox actually. How to add shadow or glow effect behind text?

Hi @Alarula Rose,

If you want it for all messages, you can add a shadow by adding the following rule to your stylesheet.
( Display > Colors > CSS stylesheet )

Code:

#chatbox .msg {
  text-shadow:0 0 3px #F00;
}

To change the color simply modify F00, which is shorthand hex for red. ( FF0000 )

If you want it in only specific messages, then you can use the table bbcode tags and add a style attribute. For example :

Code:

[table style="text-shadow:0 0 3px #F00"][tr][td]Text[/td][/tr][/table]

If you need additional information on text-shadow here are some references :
http://www.w3schools.com/cssref/css3_pr_text-shadow.asp
https://developer.mozilla.org/en-US/docs/Web/CSS/text-shadow

The latter is a bit more technical, so if you're not familiar with CSS I'd recommend the former.

Well it works perfect, but sometimes messages looks bigger than other or show under the nick... Like I use <br> or something

If I'm correct in assuming that you're using the table method, you may need to add a bit of CSS to your stylesheet. Add the following to your sheet :

Code:

#chatbox .msg table {
  display:inline-block;
  border-spacing:0;
}

That should make the tables inline instead of block-level.