tictactoe.css

@charset "UTF-8"; 
body {
  
  margin-left:500px;
  margin-top:100px;
  
}table{ 
  width:40%;
  text-align: center;
   
}
td,th {
    border: 1px solid black;
    height: 70px;
  width:70px;
}

.cross:after{
 content:"X";
  
}

.circle:after{
  content: "O";
}

.winner{
  
  background-color:red;
}