Ghost/core/client/app/styles/patterns/tables.css

/* Tables
/* ---------------------------------------------------------- */

/* Base */
table,
.table {
    margin: 1.6em 0;
    max-width: 100%;
    width: 100%;
    background-color: transparent;
}

table th,
table td,
.table th,
.table td {
    padding: 8px;
    vertical-align: middle;
    text-align: left;
    line-height: 20px;
}


/* Default Table
/* ---------------------------------------------------------- */

.table th,
.table td {
    border-top: 1px solid #dfe1e3;
}

.table th {
    color: var(--midgrey);
}

.table caption + thead tr:first-child th,
.table caption + thead tr:first-child td,
.table colgroup + thead tr:first-child th,
.table colgroup + thead tr:first-child td,
.table thead:first-child tr:first-child th,
.table thead:first-child tr:first-child td {
    border-top: 0;
}

.table tbody + tbody {
    border-top: 2px solid #dfe1e3;
}

.table table table {
    background-color: #fff;
}

.table tbody > tr:nth-child(odd) > td,
.table tbody > tr:nth-child(odd) > th {
    background-color: color(#dfe1e3 lightness(+10%));
}

.table.plain tbody > tr:nth-child(odd) > td,
.table.plain tbody > tr:nth-child(odd) > th {
    background: transparent;
}