salix/modules/order/front/summary/style.scss

vn-order-summary .summary > div > vn-horizontal > vn-one {
    min-width: 10em !important;

    &.taxes {
        border: .1em solid #CCC;
        text-align: right;
        padding: .5em !important;

        & > p {
            font-size: 1.2em;
            margin: .2em;
        }
    }
}