org-theme/scss/partials/_tables.scss

table {
    margin-left: auto;
    margin-right: auto;
    border-collapse:collapse;
    border-spacing:0;
    empty-cells:show;
    margin-bottom:24px;
    border-bottom:3px solid #e1e4e5;

    // Cell Style
    td,th{
        font-size:90%;
        margin:0;
        overflow:visible;
        padding:8px 16px;
        background-color:white;
        border:1px solid #e1e4e5;
    }

    // First Line of the Table
    thead th{
        font-weight:bold;
        border-top:3px solid #e1e4e5;
        border-bottom:1px solid #e1e4e5;
    }

    // Caption
    caption{
        color:#000;
        font:italic 85%/1 arial,sans-serif;
        padding:1em 0;

        // "Table x" part
        .table-number {
            font-weight: bold;
            color: #343131;
        }
    }

    // Alternating colors for the rows
    tr:nth-child(2n-1) td{background-color:#f3f6f6;}
    tr:nth-child(2n)   td{background-color:white;}
}