*{
  padding:0;
  margin:0;
}
#main{
  text-align:center;
  width:100%;
  height:100%;
  padding-top:100px;
}
a{
  text-decoration:none;
  border-bottom:1px dotted black;
  color:black;
}
a:hover{
  border-bottom:1px solid black;
}