#board-container {
width: 310px;
background: black;
float:right;
}

#board {
margin-left:auto;
margin-right:auto;
margin-top:auto;
margin-bottom:auto;
vertical-align:middle;
border-width: 5px;

}



#board td {
height: 100px;
width: 100px;
font-size: 90px;
font-weight: bold;
text-align: center;
background: white;
font-family: sans-serif;
color: blue;
}

.winning-square {
background: yellow;
}