feat: Export-4BitCss Background Color Support ( Fixes #42 )

Author: StartAutomating

docs/zenwritten-dark/zenwritten-dark.css

@@ -79,6 +79,22 @@
 .purple       ,  .Purple  { color: var(--purple) }
 
 .brightpurple ,  .bright-purple , .BrightPurple  { color: var(--brightPurple) }
+.black-background, .BlackBackground, .ANSI0-Background, .ansi0-background { background-color: var(--black)  }
+.red-background, .RedBackground, .ANSI1-Background, .ansi1-background { background-color: var(--red)  }
+.green-background, .GreenBackground, .ANSI2-Background, .ansi2-background { background-color: var(--green)  }
+.yellow-background, .YellowBackground, .ANSI3-Background, .ansi3-background { background-color: var(--yellow)  }
+.blue-background, .BlueBackground, .ANSI4-Background, .ansi4-background { background-color: var(--blue)  }
+.magenta-background, .MagentaBackground, .ANSI5-Background, .ansi5-background { background-color: var(--purple)  }
+.cyan-background, .CyanBackground, .ANSI6-Background, .ansi6-background { background-color: var(--cyan)  }
+.white-background, .WhiteBackground, .ANSI7-Background, .ansi7-background { background-color: var(--white)  }
+.brightblack-background, .bright-black-background, .BrightBlackBackground, .ANSI8-Background, .ansi8-background { background-color: var(--brightBlack)  }
+.brightred-background, .bright-red-background, .BrightRedBackground, .ANSI9-Background, .ansi9-background { background-color: var(--brightRed)  }
+.brightgreen-background, .bright-green-background, .BrightGreenBackground, .ANSI10-Background, .ansi10-background { background-color: var(--brightGreen)  }
+.brightyellow-background, .bright-yellow-background, .BrightYellowBackground, .ANSI11-Background, .ansi11-background { background-color: var(--brightYellow)  }
+.brightblue-background, .bright-blue-background, .BrightBlueBackground, .ANSI12-Background, .ansi12-background { background-color: var(--brightBlue)  }
+.brightmagenta-background, .bright-magenta-background, .BrightMagentaBackground, .ANSI13-Background, .ansi13-background { background-color: var(--brightPurple)  }
+.brightcyan-background, .bright-cyan-background, .BrightCyanBackground, .ANSI14-Background, .ansi14-background { background-color: var(--brightCyan)  }
+.brightwhite-background, .bright-white-background, .BrightWhiteBackground, .ANSI15-Background, .ansi15-background { background-color: var(--brightWhite)  }
 .black-fill   ,  .BlackFill   , .ANSI0-Fill,   .ansi0-fill   { fill: var(--black)  }
 .red-fill   ,  .RedFill   , .ANSI1-Fill,   .ansi1-fill   { fill: var(--red)  }
 .green-fill   ,  .GreenFill   , .ANSI2-Fill,   .ansi2-fill   { fill: var(--green)  }