JS-Game/style.css

ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #333;
    height: auto;
    width: 800px;
    position: absolute;
    top: 5%;
}

li {
    float: left;
    border-right:1px solid #bbbbbb;
}

li:last-child {
    border-right: none;
}

li a {
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

li a:hover:not(.active) {
    background-color: #111;
}

.active {
    background-color: #4CAF50;
}
#gameTable{
    position: absolute;
    transform: translate(-50%, -50%);
    left: 50%;
    top: 50%;
    background-color: #ffffff;
}
.game{
    border: solid black 0.1em;
    border-collapse: collapse;
}
.fields{
    width: 3em;
    height: 3em;
}
body{
    text-align: center;
    justify-content: center;
    background-color: #585858;
    display: flex;
    flex-direction: row;
    justify-content: center;
}