span.frac {
  display: inline-block;
  text-align: center;
  vertical-align: middle;
}
span.frac > sup,
span.frac > sub {
  display: block;
  font: inherit;
  padding: 0 0.3em;
}
span.frac > sup {
  border-bottom: 0.08em solid;
}
span.frac > span {
  display: none;
}

.MathJax {
  font-size: 1.1em !important;
}