why any web browsers show shellinabox with others colors

[GoogleCodeExporter]

What steps will reproduce the problem?
1.Open Chrome, and bg is black
2.Open Firefox, and bg is white and slow
3. ...!

What is the expected output? What do you see instead?
#vt100 #cursor.bright {
  background-color: white;
  color:            black;
}

#vt100 #scrollable {
  color:            #ffffff;
  background-color: #000000;
}

#vt100 #scrollable.inverted {
  color:            #000000;
  background-color: #ffffff;
}

#vt100 .ansi15 {
  color:            #000000;
}

#vt100 .bgAnsi0 {
  background-color: #ffffff;
}


What version of the product are you using? On what operating system?
ShellInABox version 2.10 (revision 239) / Ubuntu

Please provide any additional information below.
Neither

Original issue reported on code.google.com by xpers...@gmail.com on 17 Jun 2015 at 4:50