  column-gap: 10px;
        row-gap: 10px;
        column-rule-color: blue;
        column-rule-style: solid;
        column-rule-width: 10px;
        row-rule-color: gold;
        row-rule-style: solid;
        row-rule-width: 10px;
        flex-wrap: wrap;
    }
    .flex-item {
        background: skyblue;
        width: 50px;
    }
    .overflow {
        position: absolute;
        top: 0;
        left: 0;
        overflow: scroll;
        height: 80px;
        width: 80px;
    }
</style>
<div class="o