a:link      { color: navy; text-decoration: none; background: transparent }
a:visited    /* visited */ { color: navy; text-decoration: none; background: transparent }
a:focus { color: #990000; background-color: white; border: solid 1px gray; }
a:hover      { color: red; text-decoration: none; background: transparent }
a:active     /* active */ { color: white; text-decoration: none; background: transparent }