body{
    font-family: 'Courier New', Courier, monospace;
}
#tic-tac-toe-canvas{
    display: flex;
    flex-wrap: wrap;
    width: 300px;
    height: 300px;
}

.block{
   width: 100px;
   height: 100px;
   border: 2px solid #555555;
   box-sizing: border-box;
   display: flex;
   justify-content: center;
   align-items: center;
   font-size: 50px;
}