.frac {
    display: inline-block;
    position: relative;
    vertical-align: middle;
    letter-spacing: 0.001em;
    text-align: center;
}
.frac > span {
    display: block;
    padding: 0.1em;
}
.frac span.bottom {
    border-top: thin solid black;
}
.frac span.symbol {
    display: none;
} 
.box {
    margin: auto;
    text-align: center;
    border: 3px solid black;
    width: 200px;
    height: auto;
    padding: 5px;
  }
.text-box {
    list-style: none;
    padding: 0;
    margin: 0;
}