.sudoku-container {
    display: flex;
    flex-wrap: wrap;
    width: 300px;
    margin-top: 10px;
}
.cell {
    display: flex;
    justify-content: space-around;
    align-items: center;
    width: 25px;
    height: 25px;
    border: 1px solid #aaa;
    margin-right: -1px;
    margin-bottom: -1px;
}
.cell:nth-child(3n) {
    margin-right: 0;
}
.cell:nth-child(27n) {
    margin-bottom: 0;
}
.cell-move {
    transition: transform 1s;
}

.piece_stand {
    border: 1px dotted gray;
    background: hsl(200,50%,90%);
    padding: 0.5em;

    position: relative;
    top: 32px;
    left: 32px;
}