To change stylesheet, replace etpbms_stylesheet.css with a template (modified
or otherwise) of your choice.

etpbms_stylesheet.css
  - default is copy of etpbms_ss0.css
  
etpbms_ss0.css
  - mainframe style, black background
etpbms_ss0_nopanel.css
  - mainframe style, black background, pfkey panel hidden
etpbms_ss1.css
  - grey background; multi-color output text; blue input text
etpbms_ss1_nopanel.css
  - grey background; multi-color output text; blue input text; pfkey panel hidden
etpbms_ss2.css
  - black background; cyan/blue output text; white input text
etpbms_ss2_nopanel.css
  - black background; cyan/blue output text; white input text; pfkey panel hidden
etpbms_ss3.css
  - grey background; black input & output text
etpbms_ss3_nopanel.css
  - grey background; black input & output text; pfkey panel hidden