body
{
  font-family: Arial, sans-serif;
  font-size: 1.3em;
}

a
{
  display: inline-block;
  padding: 1em;
}

#mainDiv
{
  width: 900px;
  height: 600px;
  border: 1px solid #AAAAAA;
  margin: 0 auto;
  position: relative;
}

#Links1
{
  width: 45%;
  float: left;
  padding: 1em;
}

#Links2
{
  width: 45%;
  float: left;
  padding: 1em;
}

#Links1 a:hover
{
  color:#0000AA;
  background-color: #CCCCCC;
}

#Links2 a:hover
{
  color:#FFFF00;
  background-color: #0000FF;
}