html {
   color: black;
}

a:link { 
   color: blue;
   text-decoration: underline;
}

a:visited {
   color: purple;
   text-decoration: underline;
}

a:hover {
   color: black;
   background: rgb(255,255,0);
   text-decoration: none;
}

a:active {
   color: white;
   background: red;
   text-decoration: none;
}

.highlight {
   color: black;
   font-size: 1.5em;
   background: yellow;
}