body {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.restart-button {
    padding-top: 5px;
    padding-bottom: 20px;
}

#container {
    display: flex;
    flex-wrap: wrap;
    width: 850px;
    height: 850px;
    border-style: solid;
    border-width: 1px;
}

.cell {
    background-color: white;
    width: 6.25%;
    height: 6.25%;
}

.cell_custom {
    background-color: white;
}