body {
    background-color: aquamarine;
    text-align: center;
 }
 table {
    margin: 0 auto;
    border-spacing: 5px;
    user-select: none;
 }
 td.O {
    background-color: blue;
 }
 td.X {
    background-color: brown;
 }
 td {
    font-size: 20px;
    color: antiquewhite;
    background-color: rgb(76, 166, 153);
    border-radius: 3px;
    box-shadow: 1px 1px 3px gray;
    width: 30px;
    height: 30px;
    cursor: pointer;
 }
 button {
   font-size: 15px;
   font-family: Old Standard TT, Arial, sans-serif;
   padding: 10px;
   margin: 10px;
   background-color: rgb(76, 166, 153);
   color: antiquewhite;
   border-radius: 3px;
   box-shadow: 1px 1px 3px gray;
   cursor: pointer;
 }