body {
  background-color: black;
  color: lime;
  font-size: medium ; 
  font-family: Consolas,Monaco,Lucida Console,Liberation Mono,DejaVu Sans Mono,Bitstream Vera Sans Mono,Courier New, monospace;
}

#banner_container {
   text-align: center;
 }

#banner {
  display: inline-block;
  text-align: left;
}