body{ color: black; background-color: white; 
      border-style: solid; padding:1em;
      border-color : green; border-width : 20px;
    }
h1{ color: white; background-color: green; text-align: center}
h2{ color: green; background-color: aqua; text-align: center}
h3{ color: black; background-color: aqua; text-align: left}
/*
div{ text-align: left; align: center}
*/
p { color : black; background-color: white }
code { color : green }
.command { font-weight: bold; color : blue}
/*
table { background-color : #ccccff }
*/