.container {
    display: flex;
    flex-wrap: wrap;
    width: 672px;
    height: 672px;
    border: 7px solid black;
    padding: 0;
    margin: 0;
}

.default-grid {
    border: 1px solid black;
    width: 42px;
    height: 42px;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.user-grid {
    border: 1px solid black;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}