.qb-frac { display: inline-flex; flex-direction: column; align-items: center; vertical-align: middle; margin: 0 .18em; line-height: 1.15; font-size: .92em; text-align: center; }
.qb-frac-num { padding: 0 .25em .06em; border-bottom: 1.5px solid currentColor; }
.qb-frac-den { padding: .06em .25em 0; }