body {
   margin-left: 10%; margin-right: 10%;
   color: black; background: white;
   font-family: Arial, Verdana, sans-serif; 
}

h1 { margin-top: 2em; margin-bottom: 2em; }
em { font-style: italic; }
strong { font-weight: bold; }
pre { font-family: monospace; }
h1,h2,h3,h4,h5,p,ul { font-family: Arial, Verdana, sans-serif; }

div.box { 
   border: solid;
   border-width: thin;
   width: 95%; 
   border-color: black;
}

div.color {
   background: yellow;
   padding: 0.5em;
   border: none;
}

:link { color: blue; } /* for unvisited links */
:visited { color: red; } /* for visited links */
a:active {color: green; } /* when link is selected */
a:hover { color: #0099FF; } /* when mouse is hovering over link */