style.css

body {
    font-family: Arial, Helvetica, sans-serif;
    color: white;
}
table#game td {
    background-color: lightcoral;
    color: purple;
    height :150px;
    width : 150px;
    border : solid rebeccapurple 5px;
    border-radius: 10px;
    text-align : center;
    font-weight: bolder;
    font-size : 60pt;
}

table#game td:hover {
    opacity: 95%;
}
a.aa{
    position: fixed;
    left: 1200px;
    top : 330px;
    display:inline-block;
    padding:0.35em 1.2em;
    border:0.1em solid #FFFFFF;
    margin:0 0.3em 0.3em 0;
    border-radius:0.12em;
    box-sizing: border-box;
    text-decoration:none;
    font-family:'Roboto',sans-serif;
    font-weight:400;
    color:#FFFFFF;
    text-align:center;
    transition: all 0.2s;
}
a.aa:hover{
    color:#000000;
    background-color:#FFFFFF;
    font-weight: 500;
}